added 'rgb' and 'alpha' arguments to 'RenderTexture.clear' (closes #460)
added static 'defaultTextureFormat' property to TextField (closes #461)
added missing 'mContextValid' setting in 'Starling.dispose' method (refs #456)
now prefering RectangleTextures even for POT textures (closes #409)

Because of Stage3D-internals, POT-Textures use up more memory as necessary (they always allocate mipmaps, whether you need or not). RectangleTextures do not suffer from this problem, so it makes sense to default to RectangleTextures all the time.

The downside: after it has been created, you cannot change the "repeat" property of a texture any more. The repeat setting must now be chosen when you create the texture. For this reason, all "Texture.from..." methods now contain a new "repeat" property.

Thus, this change breaks the API at this point (although I don't expect the repeat property to be in use very often).
removed obsolete code
fixed maximum size of QuadBatch

That old value has been in there since the beginning; either I had it wrong back then, or the stage3D specification changed. ;-) Thanks to shin10 for making me aware of this!
added new 'TextureOptions' class, used by 'Texture.fromData' and 'AssetManager.enqueueWithName'

In the Texture class, this makes the huge number of parameters to the "from..."-methods easier to handle; in the AssetManager, this allows to supply custom options for each added texture.
removed obsolete imports
now creating QuadBatch's AGAL programs lazily on first usage (closes #466)

This drastically improves startup-time. Typically, only very few of the programs are required, anyway. Thanks to ajwfrost for making me aware of this!
raised AIR xml namespace references to 4.0
updated asdoc path to latest revision

Sorry for that being rather specific to my own system :-/
fixed asdoc comment
added support for automatic profile selection (closes #337)

Requires AIR 4.0 to work. Per default, Starling now picks the best available profile. Alternatively, you can pass a vector or array with the profiles you want to support.
simplified mathematics of 'DisplayObject.transformationMatrix' setter
fixed missing textField-dispose in Button; fixed text alignment getters (refs #456)
added missing null reference check
now disposing objects when they are overwritten by new ones in AssetManager (closes #467)

Furthermore, added dispose/clear calls for XMLs and ByteArrays in 'dispose' method.
added missing support for Vectors in "profile" argument; now picking lowest available profile in older AIR versions (instead of the first list element) (refs #337)
added more api docs about render context and context loss (refs #337)
now surviving a context loss happening while processing the asset queue (closes #472)