Merge pull request #6 from HaxeFlixel/dev

Dev
Added distanceWithin()
Added IncludeEqual param to distanceWithin()
Added other distanceWithin functions
Added prefix "is" to the distanceWithin functions

to more clearly indicate a Bool return
Merge pull request #695 from kevinresol/master

Added distanceWithin() functions to FlxMath
Merge commit '716b5dcb7b58bc0d86b986578b2e3cc957403934'
Merge branch 'dev'
Added function mergeFlxSprite

Quickly draw one FlxSprite on top of another.
Fixed mergeFlxSprite

Maybe I should commit the right version or something oops...
Update FlxPreloader.hx

Fixes the Preloader_gets_stuck_on_Chrome. No reason for disabeling it anymore.
Merge pull request #706 from sruloart/patch-1

Update FlxPreloader.hx
Adding FlxAndroidKeys.hx

Adding new input to handle built-in Android keys/buttons.
Removing debugging stuff...
Create FlxAndroidKeyList.hx
Added FlxAndroidKeys

Added reference to FlxAndroidKeys.
Update FlxAndroidKeys.hx - fixed bug with Menu key

Okay, so the value for the Menu Key was too big to work in an array the same way as in FlxKeyboard... so I changed things around to use a Map instead of an array.

If anyone can figure out any other Android key constants, please add them!
Add iterator for groups (all, dead, alive, exists)
iteratorAlive: check if alive AND exists
FlxSpriteGroup: Remove motion var overrides, fixes #716, misc improvements