marked a NaN != NaN check with a //isNaN comment to hopefully help avoid confusion.
Feathers 2.0 will require Starling 1.5.1
Text renderers and text editors will use non-POT textures when the profile supports it (closes #898)
TextBlockTextRenderer, TextFieldTextRenderer: use generateFilterRect() to get correct texture dimensions when nativeFilters property is in use (closes #899)
TextFieldTextRenderer: removed unncessary clipping that TextField does automatically