cleaned blendQuads sample
blendDrawables sample

added sample for blend of drawable objects
Color._paramConversion

utility function used to convert a generic color rapresentation (0..255
based) into a r,g,b,a values (0..1 based)
Color._paramConversion usage

- DisplayObjects rely on Color._paramConversion for all the setColor
calls
- removed old support definitions
DrawableObject:setPenColor

DrawableObject:setPenColor wraps MOAIGfxDevice.setPenColor handling
object alpha mode (if premultiplied alpha is used it automatically
convert rob channels)
comments fix
update .gitignore

Added local development folders
Texture:getSize

- exposed Texture: getWidth / getHeight / getSize
- Texture.fromColor relies on Color._paramConversion
- added rough version of Texture.fromData