- Optional limit for the amount of gas transactions may have;
- option to restruct transactions returned/queried to only those
which have been executed.

* replace deprecated hashdb method names

* spaces -> tabs

Rather than just the canon chain.

Rather than just the canon chain.

* Introduce whitelist for softfork

* Use extradata for fork id.

* Fix condition.

* Removing old transactions

* Explanation comment [ci skip]

* bump rust-crypto

* initial version of account provider utilizing secret store

* update lazy_static to latest version

* AccountProvider accounts method

* new AccountProvider tests in progress

* basic tests for new AccountProvider

* ethcore compiles with new account provider and secret store

* ethcore-rpc build now compiling with new AccountProvider

* most rpc tests passing with new accounts_provider

* fixed basic_authority tests

* fixed eth_transaction_count rpc test

* fixed mocked/eth.rs tests

* fixed personal tests

* fixed personal signer rpc tests

* removed warnings

* parity compiling fine with new sstore

* fixed import direction

* do not unlock temporarily when we have the password

* removed TODO in account import

* display warning on auto account import failure

* fixed compiling of ethstore on windows

* ethstore as a part of parity repo

* added ethkey

This mimics the fucntionality of Geth and the current unratified
JSONRPC spec (but not the functionality of eth and the ratified
spec).

Soft-fork will remain default behaviour, but you can now disable
either the whole mechanism (you'll lose money if you mine with this
when the majority network doesn't) or just vote against it but
otherwise go with the flow.