Rpc personal tests

Fixing warnings

docopts cleanups

Removed rocksdb build dependency

Fixed splitting Neighbours packet

one for @LefterisJP: 80-character line for docopts.

management of account expiration & memory

Remove EarlyMerge from user docs.

Fixes and traces for refcountdb.

Check for NULL_RLP in AccountDB

ethminer as crate

Conflicts:
	parity/main.rs

Old ref-counted DB code

next batch of rpc tests and fixes