enabled zmq4 code
various cosmetic changes and non-c++11-compliancy fixes
BtcRpc no longer returns successful when it wasn't
added support for older bitcoin-qt versions
bugfixes in 'getbalance' and elsewhere
slight change of bitcoin-api arguments reflecting changes in bitcoin's rpc api
Merge pull request #108 from tuttleorbuttle/develop

bitcoin-api 0.9 legacy compatibility, various bugfixes