Fix particle gravity, so it's not framerate dependant.
Add getter and setter for TextField and TextFormat properties
Minor memory improvement
Add Stamp.createRect method
Add a Tilemap.tileCount getter
Fix a bug with the text alignment fixer: if different lines had different font sizes, weirdness occurred.
Add getColorHue getColorSaturation getColorValue helper methods
World.collidePoint() should not return entities with collidable = false
Improve documentation of World.collideLine().
When creating a tween with a delay on starting, now FP.tween() returns the actual tween, not a tween that will start a different tween after the delay.
ASDocs build without error.
Merge pull request #54 from BlckKnght/particle-gravity

Particle gravity
Merge pull request #67 from Svenito/text-fix

Add getter and setter for TextField and TextFormat properties
Add Image.createGradient() method.
Image scaledWidth/Height returns a Number now

Image scaledWidth/Height, as well as Text scaledWidth/Height, will
return a Number one, instead of an uint.
Make scaledWidth and scaledHeight settable properties
Switching world A->B->A in same frame goes to world B
Improve documentation for Image properties.
Document frameRate argument for Spritemap.add()
Improve documentation of Text.setStyle() and Text.richText.