* Ledger devices support

* structs for RPC types

asynchronous rob authored Feb 06, 2017 and Arkadiy Paronyan committed Feb 06, 2017

* CHT builder and prover

* use CHT abstraction in provider

* hide CHT internals from header chain

* fix itertools conflict by updating all to 0.5

* cht proof checker, use it in on_demand

* vaults RPCs

* vault.password != vault_account.password

* moved vault RPCs to parityAccounts NS

* parity_listVaults + parity_listOpenedVaults

* data structures initial

* hard derivation

* tabs, docs

* more docs

* soft private derivation

* public derivation

* finalize api, fix warnings

* use simple new()

* keypair api

* bump byteorder

* doc tweaks

* remove heavyness from tests

* added test vector infrastructure and examples

* initialization from seed to key pair

* add comment about panic

* Adding RPC informant structs

* RPC informant

* Middleware counting RPC requests

* Moving client keep_alive to middleware

* Transaction timestamp condtiion

* Updated docs

* Updated docs

* Check agains last block timestamp

* Parametrize address book

* Improving types in account_provider

* Filtering dapps_accounts

* Fixing RPC tests

* tracing, timeouts

* remove env_logger

* Infering default account when sending transactions if not provided

* Fixing test

* Fixing tests code

* Fixes.

* More fixes.

* Final fix.

* initial commit for vaults

* fixed TODO

* public docs

* vault_file.json now contains enc(pwd hash)

* removed doc

* Tests for RPC

* Extracting dapp_id from Origin and x-parity-origin

* Separate type for DappId

* Persistent tracking of recent dapps

* Fixing tests

* Exposing dapp timestamps

* Fixing import to work on stable

* Fixing test again

* EIP98: Optional receipt state root

* Use if-else

* Fixing tests

* Fix whitespace.

* Update copyright years/owner.

* Push release only for tags.

* flush work

* flush work

* flush work

* flush work

* generalized notifiers

* general setup with modules

* general setup with modules

* all binded

* catch up with master

* all dependencies injected

* stratum another up

* tcp update

* submitwork routine

* finalize & fix warnings

* merge bugs, review fixes

* merge bugs, review fixes

* new cli mess cleanup

* usage.txt swap

* flush work

* cli adopt

* compilation with new cli sorted

* subid space in json

* serialization issues

* grumbles addressed

* more grumbles

* remove last_work note for now

* fix compilation

* fix tests

* merge bugs

* no obliged ipc

* moving notifiers

* no optional feature now

* refactored again

* working on tests

* refactor to new tcp/ip

* stratum lib ok

* ethcore crate ok

* wip on tests

* final test working

* fix warnings, \n-terminated response

* new compatibility

* re-pushing work once anybody submitted

* various review and general fixes

* reviewe fixes

* remove redundant notifier

* one symbol -> huge bug

* ensure write lock isn't held when calling handlers

* extern declarations moved

* options to stratum mod, SocketAddr strongly-typed instantiation

* Minor style fix.

* Whitespace and phrasing

* Whitespace

* Logging transaction duration

* Printing time also on heavy transactions [ci:skip]

* move modules up

* make structs generic

* reound to view and tests

* fix