Updated to Spiller v2.2

Added a simple Multiplayer Example.
Added the multiplayer-extension (Under Development).
Moved PocketChange to a new extension.
Moved the controller system to a new extension.
Added a simple field to SpiBasic, in order to hold whatever the
programer wants.
Fixed the setScale method in SpiSprite and renamed to scale.
Added the floorPowerOfTwo method to SpiU.
Fixed a couple of bugs in SpiMath and in SpiTextInput.
Added the "ADD" blend mode.
Updated the SpiPreferences class.
Ported the SpiWeapon plugin from powertools.
Added generic callback for multiple uses.
Added a water manager (Under Development).
Added a couple of utility classes, some of them ported from Android
Source Code.
Started the GWT (HTML 5) backend.