Summary:
A few improvements to JS API:
1) non-dummy responders - now we can reply to flipper
2) respecting flipper communication protocol: getPlugins, getBackgroundplugins, init, deinit, execute
adding linters
Reviewed By: jknoxville
Differential Revision: D22307525
fbshipit-source-id: 2f629210f398d118cc0cb99097c9d473bb466e57
