Merge branch 'release/0.2.0' into develop
patched pubsub_client to initialize @sub_callbacks and @psub_callbacks prior to connect. to all .pubsub.subscribe before connect
Merge pull request #2 from jfis/develop

patched pubsub_client to initialize @sub_callbacks and @psub_callbacks p...
remove printing sentinel list
Merge pull request #3 from jfis/develop

remove printing sentinel list
0.2.2 release removes debug puts code
Merge branch 'release/0.2.2'