Continuing trivial migration of API implementations to client object. Moved wallet open, create, export, lock, unlock, and change passphrase methods. Minor cleanups to return types, etc, also.
Fixing tests.
more RPC API migration to client object and minor code review changes
Merge branch 'master' of https://github.com/BitShares/bitshares_toolkit
delegate ranking is only updated once per round (every BTS_BLOCKCHAIN_NUM_DELEGATE blocks)
Merge branch 'master' of https://github.com/BitShares/bitshares_toolkit
Merge remote-tracking branch 'upstream/master'