Merge pull request #216 from crazysam/dev

Optimizations and new functionality in FlxJoystick
FlxGridSprite is working on flash now, but not on other targets
started working on typed groups
a little less casting
getters/setters update for Haxe 3 compatibility
Nape debug graphics camera follow sync fix by : rbourdon
Merge branch 'flixelNME' of https://github.com/ProG4mr/HaxeFlixel into flixelNME
First sprite filters mechanism.
#186 use FLX_NO_DEBUG to follow pattern of other FLX_NO. The debugger will be enabled by default and still easy to disable for release.
merge fix
Added method to change the sprite clipping area, important for filters like outerglow or dropshador or blur.
Merge pull request #232 from impaler/dev

#186 use FLX_NO_DEBUG to follow pattern of other FLX_NO. The debugger wi...
haxe 3 set_alpha
Merge pull request #234 from impaler/dev

haxe 3 set_alpha
Correction for sprite position after changing the clipping area.
remove the input list, use the conditionals
Merge pull request #236 from impaler/dev

remove the input list, use the conditionals
input conditionals
Merge pull request #237 from impaler/dev

input conditionals for PxButton
some button refactoring (now you can have buttons with labels of different types)