Implemented openfl.display.BitmapData#histogram method in HTML5 backend.
Implemented openfl.display.BitmapData#(get|set)Vector methods in HTML5 backend.
Bind openfl.external.ExternalInterface#call to proper this.
Merge pull request #252 from ioga/js-call-this

Bind openfl.external.ExternalInterface#call to proper this in html5 backend.
Merge pull request #253 from ioga/improve-bitmapdata

Implemented histogram, setVector, and getVector methods at openfl.display.BitmapData in HTML5 backend.
Filter JoystickEvent.AXIS_MOVE

JoystickEvent.AXIS_MOVE receives updates axis by axis: it was previously sending a JoystickEvent each time, even if no axis values changed. It is now counter-checking incoming values with the previous registered state, only sending the JoystickEvent according to difference in values, avoiding overflow.
Merge pull request #255 from Hasufel/patch-1

Filter JoystickEvent.AXIS_MOVE