Merge branch 'nickholub-master'
Removed existing PubSubWebSocket operator tests and helpers #54
Added test that tests PubSubWebSocketInputOperator and PubSubWebSocketOutputOperator fixes #54
Added comments that the web socket message parsing and composing will be available from API and the users should not rely on the code that is doing it currently in the library #54.
Fixed warnings #54.
added error message
Clean input operators in lib fixes #15
Merge branch 'master' of https://github.com/siyuanh/Malhar into siyuanh-master
Added link for signup to google groups. Added brief information about webdemos.
Merge remote-tracking branch 'upstream/master' into webdemos