* Adds `impl_json_metadata!` for generating all metadata of a runtime

* Adds `json_metadata` RPC call

* Adds simple test for the `json_metadata` RPC call

* Implements json metadata in the demo runtime

* Fix indent

* Adds missing copyright headers

* Dispatch json metadata renamings and improvements

* Replaces `format!` & `String` with `Vec<JSONMetadata`

* Implements `Encode` and `Decode` for JSONMetadata

* Make `impl_json_metadata!` compileable on `no_std`

* Adapt the client to decode the correct type for `json_metadata`

* Fixes compile error and warning

* Whitespace

* Updating substrate-demo

* Consenus fixes

* Reverted toolchain change

* Adjusted timeout formula

* Simplfied proposal creation

* Fixed tests

* Fixed a few small issues

* 2017->2018

* Style

* More style

* Renamed demo executable to substrate

* Style

* Fixed compilation after merge

* Style

* Treasury in runtime, generic approve/reject

* Add logic for council origin

* Add tests.

* Configurable number of members in EnsureMembers

* Fix grumbles

* Fix spelling

* Comment

* Democracy module events

* Fix demo runtime

* Fix

* Extra event in balances

* Missing event

* Fix test

* Fix council

* Fix test

* LocalCallExecutor and RemoteCallRequest generic over Hasher and NodeCodec

* Fix client/db

* Use new triehash

* Use new triehash
Don't use ethereum-types from rlp

* New triehash

* Use new triehash

* fixes and rlp without ethereum-types

* Lockfile

* lockfile

* Rename enumerated_trie_root to keccak_rlp_enumerated_trie_root

* Rename ordered_trie_root -> keccak_rlp_ordered_trie_root
Rename trie_root -> keccak_rlp_trie_root

* Fix panic message

* Kick the ball one step up the ladder

* Normalize function signatures between wasm and native

* Sort out compilation and test errors

* Cleanup

* Constrain the wasm-version using an ExternTrieCrypto trait that is implemented only for KeccakHasher

* hashdb is not optional

* lockfile

* Runtimes

* Missing bounds

* wasm binaries

* lockfiles

* binaries

* LocalCallExecutor uses concrete hasher/codec

* Use binaries from master

* Externalities is concrete
RuntimeInfo is not generic

* whitespace grumble

* lockfile

* lockfile and binaries

* runtime-storage: add 'mutate' api

* support mutate for StorageValue

* try adding 'mutate' for map

* dispatch on Option<> type

* add check for prev_some

* consolidate the wrap type

* unify wrap type handling

* add sample for StorageValue

* System and Balances switched to new call model

* Fixed up executive for new pardigm

* Consensus works with Origin

* Timestamp ported over

* Session now compatible

* Ported staking

* Treasury compatible

* Expunge MaybeEmpty

* Make democracy work

* Council compatible

* Remove some aux-dispatch stuff and fix balances

* Rename aux -> origin, fix contracts

* Fix test

* Fix example

* Update macro to remove superfluous cruft

* Make work with new macro

* Tests

* Fix some tests

* Tests

* Fix grumbles

* Final grumble

Progress on: #535

* Use BufReader and BufWriter

* Add TODOs

* `decl_storage!` exposes json metadata about the storage

The metadata can be accessed by calling `store_json_metadata()`.

* Hide internal macros in the documentation

* Include the function documentation in the store json metadata

* Adapt the storage declarations to use doc comments

* impl MaybeEmpty for H256 and u64 (aka AccountId in prod/tests)

* binaries

* DigestItem trait

* removed autoimpl in impl_outer_log

* StubDigestItem -> ()

This reverts commit ad89579f.

This reverts commit 7c18bb60.

* Fetch parity-common dependencies from crates

* Update triehash

* Fix code to fit latest triehash
Fetch kvdb-rocksdb from crates

* type params

* lockfile

* lockfiles

* wasm binaries and lockfile

* Somerhing wrong.

* My attempt to fix

* cfg_attr for serde

* Fix tests

* Include function comments into modules `json_metadata`

All doc comments (with `///`) are included in the description field of
the function.

Progress on #535

* Replace spaces with tabs

* storage proofs

* CHT

* Introduce treasury and document

* Revert bad changes

* More reversions

* Add example crate

- Remove HasPublicAux
- Rename Concrete -> Runtime

* Actually commit stuff

* Changes

* Propagate block number in finalise.

* Fix and build example

* Fixes.

* Fix compilation for treasury.

* Fix the treasury test

* Tests

* Fix.

* Fix tests

* Fix a few grumbles

* Fixes

* Fix grumbles

The new function `json_metadata` returns the module declaration
as a json string.

Progress on: #535

* Add a reputation system

* Fix tests

* Don't try to dial peers to which we are already connected

* Use the master branch of libp2p

* Rename ext_transfer → ext_call

There are several tests where gas was changed. This is due to shrinking
the name and consequently a size of contracts.

* Fix macros

Specifically, make fixes that allows to use a function without arguments (apart from ctx).
For example:

```rust
ext_return_42(ctx) -> u32 => {
    Ok(42)
}
```

Also, add impl ConvertibleToWasm for u64.

* Implement passing input data buffer from top-level

This allows the transaction initiator to pass some input data that can be accessed from the executed contract.

However, this only works for the top-level contract. The contract still cannot pass input data to the callee contract. The reason for that is that API doesn't support this presently.
This will be addressed in the following commits.

* Input data passing thru `ext_call`

`ext_call` now takes a buffer (or more specifically, pointer  to the start of and size of a buffer).

This allows contracts to pass input data while calling into other contracts.

* Input data passing thru `ext_create`

Same as previous commit but for `ext_create`.

* Trap on decoding error instead of panicking

* Don't cascade failure in ext_call

Instead, if callee doesn't complete successfuly, return a non-zero status code.

This will prevent cascading traps up to the top-level. Due to this some tests were altered so that they now expect successful transfer instead of a failure.

* Don't cascade failure in ext_create

Same as previous commit but for ext_create.

* Specify how much gas to allot for a call

* Specify how much gas to allot for a create

* Update tests.rs

* move heap size on chain

* fix the interface change

* decode heap size

* fix code comments

* fix comment

* update Cargo.lock

* rename to heappages

* add one heap pages variable in runtime

* Initial draft

* Fixes

* Extrinsic success events