add rpc() method to export a RPC object, which will usually bind some APIs later, then bind a port
change repository url
merge iamfat/zmq-jsonrpc
add calling("*") to handle all undefined methods
Merge branch 'master' of https://github.com/iamfat/zmq-jsonrpc

Conflicts:
	index.js
change calling("*") to callingDefault()
add `return` after half-way _response()
Merge pull request #1 from toksea/master

add zRPC.callingDefault() to handle all undefined methods