Rewrite some Future structs as async functions (#679)

* Squashed commit of the following:

commit e97a1715
Author: Ashley <[email protected]>
Date:   Tue Dec 10 15:06:28 2019 +0100

    Rewrite some functions as async

commit 970e4851
Merge: f98966ac 47828402
Author: Ashley <[email protected]>
Date:   Tue Dec 10 11:19:37 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-futures-update

commit f98966ac
Author: Ashley <[email protected]>
Date:   Mon Dec 9 23:40:20 2019 +0100

    Add async blocks back in

commit 7fa88af0
Author: Ashley <[email protected]>
Date:   Mon Dec 9 23:17:02 2019 +0100

    Revert "Asyncify network functions"

    This reverts commit f20ae654.

commit 82413550
Author: Ashley <[email protected]>
Date:   Mon Dec 9 19:09:55 2019 +0100

    Fix validation test again

commit 47e002b0
Author: Ashley <[email protected]>
Date:   Mon Dec 9 19:07:43 2019 +0100

    Switch favicon

commit 0c5c1409
Author: Ashley <[email protected]>
Date:   Mon Dec 9 18:54:10 2019 +0100

    Fix validation test

commit 8bb6a018
Author: Ashley <[email protected]>
Date:   Mon Dec 9 18:53:54 2019 +0100

    Nits

commit 33410f3a
Author: Ashley <[email protected]>
Date:   Mon Dec 9 18:43:09 2019 +0100

    Fix av store test

commit f0c517eb
Merge: 938f411a 60e72111
Author: Ashley <[email protected]>
Date:   Mon Dec 9 18:21:39 2019 +0100

    Merge branch 'ashley-futures-updates' into ashley-futures-update

commit 60e72111
Author: Ashley <[email protected]>
Date:   Mon Dec 9 18:19:40 2019 +0100

    Clean up browser validation worker error

commit f20ae654
Author: Ashley <[email protected]>
Date:   Mon Dec 9 18:16:40 2019 +0100

    Asyncify network functions

commit b22758d0
Merge: 2e8b05ed ca8d5c54
Author: Ashley <[email protected]>
Date:   Mon Dec 9 17:47:26 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-futures-updates

commit 2e8b05ed
Author: Ashley <[email protected]>
Date:   Mon Dec 9 17:45:52 2019 +0100

    Box pin changes

commit 08bfdf7f


Author: Ashley <[email protected]>
Date:   Mon Dec 9 17:15:38 2019 +0100

    Update network/src/lib.rs

Co-Authored-By: Pierre Krieger <[email protected]>

commit d8be456c


Author: Ashley <[email protected]>
Date:   Mon Dec 9 17:15:32 2019 +0100

    Update network/src/lib.rs

Co-Authored-By: Pierre Krieger <[email protected]>

commit ec736727


Author: Ashley <[email protected]>
Date:   Mon Dec 9 17:14:36 2019 +0100

    Update availability-store/src/worker.rs

Co-Authored-By: Pierre Krieger <[email protected]>

commit 938f411a
Author: Ashley <[email protected]>
Date:   Mon Dec 9 17:05:05 2019 +0100

    Revert "Revert removal of tokio_executor that causes tokio version mismatch panic"

    This reverts commit cfeb50c0.

commit f92f5804
Author: Ashley <[email protected]>
Date:   Mon Dec 9 15:47:35 2019 +0100

    Fix adder test parachain

commit cfeb50c0
Author: Ashley <[email protected]>
Date:   Mon Dec 9 15:31:36 2019 +0100

    Revert removal of tokio_executor that causes tokio version mismatch panic

commit 5bcb83a1
Author: Ashley <[email protected]>
Date:   Mon Dec 9 15:17:55 2019 +0100

    Fix typo

commit fc02b1dc
Author: Ashley <[email protected]>
Date:   Mon Dec 9 15:02:50 2019 +0100

    Fix collator

commit 6c4ff5b3
Author: Ashley <[email protected]>
Date:   Mon Dec 9 14:35:37 2019 +0100

    Small changes

commit e1338cb4
Author: Ashley <[email protected]>
Date:   Mon Dec 9 14:24:42 2019 +0100

    Fix network tests

commit 4e458f7a
Author: Ashley <[email protected]>
Date:   Mon Dec 9 12:25:26 2019 +0100

    Remove futures01 from availability-store

commit 5729f6cd
Author: Ashley <[email protected]>
Date:   Mon Dec 9 12:22:33 2019 +0100

    Fix validation tests

commit a8206125
Author: Ashley <[email protected]>
Date:   Mon Dec 9 12:01:48 2019 +0100

    Fix availability store tests

commit 112344fa
Author: Ashley <[email protected]>
Date:   Mon Dec 9 11:36:03 2019 +0100

    Update tokio version

commit d2de6d8b
Author: Ashley <[email protected]>
Date:   Mon Dec 9 11:33:25 2019 +0100

    Revert cli tokio version to avoid libp2p panic

commit 0c5f24e0
Author: Ashley <[email protected]>
Date:   Mon Dec 9 11:27:13 2019 +0100

    Switch to polkadot-master

commit 2e2311e3
Author: Ashley <[email protected]>
Date:   Fri Dec 6 15:07:21 2019 +0100

    Re-add release flag

commit 6adc1b61
Merge: 9767f832 5e9542c8
Author: Ashley <[email protected]>
Date:   Fri Dec 6 13:36:35 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-compile-to-wasm

commit 9767f832
Merge: c528dc6d 84ece424
Author: Ashley <[email protected]>
Date:   Wed Dec 4 17:11:39 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-compile-to-wasm

commit c528dc6d
Author: Ashley <[email protected]>
Date:   Wed Dec 4 17:07:00 2019 +0100

    Fix wasm build

commit da233a12
Author: Ashley <[email protected]>
Date:   Wed Dec 4 16:25:49 2019 +0100

    tidy

commit 832f8054
Merge: 4e1da888 78e828d8
Author: Ashley <[email protected]>
Date:   Wed Dec 4 15:56:56 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-compile-to-wasm

commit 4e1da888
Author: Ashley <[email protected]>
Date:   Tue Dec 3 16:47:02 2019 +0100

    Temp switch back to substrate/master

commit af88a873
Merge: a03a980c abb51115
Author: Ashley <[email protected]>
Date:   Mon Dec 2 19:33:14 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-compile-to-wasm

commit a03a980c
Merge: 31a88a93 f7d48261
Author: Ashley <[email protected]>
Date:   Mon Dec 2 13:52:37 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-compile-to-wasm

commit 31a88a93
Author: Ashley <[email protected]>
Date:   Mon Dec 2 13:52:35 2019 +0100

    Tidy

commit 5b33b7a7
Author: Ashley <[email protected]>
Date:   Mon Dec 2 11:55:51 2019 +0100

    Add browser-demo

commit 868f6e51
Author: Ashley <[email protected]>
Date:   Mon Dec 2 10:51:57 2019 +0100

    Add initial browser file

commit e5e399c2
Author: Ashley <[email protected]>
Date:   Mon Dec 2 10:45:02 2019 +0100

    Add browser-demo

commit 408288b0
Author: Ashley <[email protected]>
Date:   Sun Dec 1 19:28:33 2019 +0100

    Get polkadot to compile via wasm!

commit 04ffe72e
Author: Ashley <[email protected]>
Date:   Sun Dec 1 19:28:16 2019 +0100

    Migrate service

commit 119f0829
Merge: 93fb6428 5422684f
Author: Ashley <[email protected]>
Date:   Sun Dec 1 17:43:49 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-compile-to-wasm

commit 93fb6428
Author: Ashley <[email protected]>
Date:   Sun Dec 1 12:21:25 2019 +0100

    Switch branch

commit 0c4fe833
Author: Ashley <[email protected]>
Date:   Sat Nov 30 11:45:59 2019 +0100

    Tidy up validation

commit 73563253
Author: Ashley <[email protected]>
Date:   Sat Nov 30 11:39:09 2019 +0100

    Tidy up network

commit 1c9cf042
Author: Ashley <[email protected]>
Date:   Sat Nov 30 01:16:35 2019 +0100

    Final changes to validation

commit 322cca52
Author: Ashley <[email protected]>
Date:   Sat Nov 30 00:31:55 2019 +0100

    Migrate network to std futures

commit 96f1a994
Author: Ashley <[email protected]>
Date:   Fri Nov 29 23:31:04 2019 +0100

    Migrate validation to std futures

commit aaf5e55f
Author: Ashley <[email protected]>
Date:   Fri Nov 29 17:10:11 2019 +0100

    Switch to Spawn trait

commit 2ab282f5
Merge: cceb6b72 5598ed9b
Author: Ashley <[email protected]>
Date:   Fri Nov 29 16:31:24 2019 +0100

    Merge remote-tracking branch 'parity/master' into ashley-compile-to-wasm

commit cceb6b72
Author: Ashley <[email protected]>
Date:   Fri Nov 29 15:47:14 2019 +0100

    Make validation work on wasm!

commit b45a95cf
Merge: 3773d5c1 db7eaa6b
Author: Ashley <[email protected]>
Date:   Fri Nov 29 13:57:23 2019 +0100

    Merge remote-tracking branch 'tomaka/wasm-start' into HEAD

commit db7eaa6b
Merge: 6f97dbb7 2ab32dac
Author: Pierre Krieger <[email protected]>
Date:   Thu Nov 28 13:58:15 2019 +0100

    Merge branch 'master' into wasm-start

commit 6f97dbb7
Author: Pierre Krieger <[email protected]>
Date:   Thu Nov 28 12:47:45 2019 +0100

    Use --manifest-path instead

commit 20104e98
Author: Pierre Krieger <[email protected]>
Date:   Thu Nov 28 10:44:51 2019 +0100

    Make availability-store compile for WASM

* Fix build

* Fix futures blocking panic in validators (again)

* Deindent