* Use latest version of txpool.
* Initial version of the pool.
* Fix abstraction.
* Implement watchers and notifications.
* Return hash from RPC.
* Remove commented code.
* Remove client dep.
* Fix tests.
* Implement transaction queue RPC.
* whitespace
* Support without_std env in environmental! (#110)
* Make environmental crate support without_std env.
* Small doc fixes.
* Remove dead code.