added doc for WNS
added lib for wns
implemented wns send
added tests for wns
fix in readme
fixed wns callback signature
channelURI sent with transmitted and transmissionError
Merge pull request #2 from yanhick/wns

add WNS support
v1.1.0
Use string for version (in travis).
an option object can optionaly be passed to wns lib
fixed options creation, dont need an empty object first
fixed doc