Begin moving JSON-RPC API implementations out of rpc_server.cpp into the client object. rpc_server.cpp will only be responsible for converting JSON parameters/return values, leaving us with a C++ API in client that mirrors the JSON-RPC api. This will also ultimately help us to write tests that can be re-used for testing with and without the networking code enabled.
Merge branch 'master' of https://github.com/BitShares/bitshares_toolkit