Added record/playback over iframe, see #174
Improved iframe API for playback/record, see https://github.com/phetsims/joist/issues/174
Removed console.log statement, see #174
Removed : characters from API syntax, see https://github.com/phetsims/joist/issues/174
Renamed PhETAPI->SimIFrameAPI
Added documentation to SimIFrameAPI
merged emitStates and stateListeners
Added untested adapter for emitting events
Renamed emitEvents => addSimEventListener etc.
Removed extra comma
Removed active field from API to Sim, see #174
inlined one var, see #174
Added API docs, see #174
Added API docs, see #174
Added a query parameter to enable the SimIFrameAPI, see https://github.com/phetsims/joist/issues/176
Merge branch 'together'