Merge pull request #81 from SeiferTim/dev

Fixing Toggle Button Slice9 Sprites.
Allow setting bg color in constructor
Merge pull request #82 from kevinresol/patch-2

Allow setting bg color in constructor
Missing import
compile fixes for some of the classes
Added ability to show/hide groups, thanks @ProG4mr
<sprite> tags will now automatically scale if you supply "width", "height", and/or "resize_ratio" attributes
"spacing" attribute in <align> tags can now use formulas.
<sprite> tag now infers which axis it should use resize_ratio for based on whether width or height is undefined
Update README.md

Updated documentation for scaleable sprites
Update README.md

Updating documentation for buttons
Update README.md

Updated documentation for text/inputtext
minor change
Merge pull request #83 from HaxeFlixel/render_refactor

compile fixes for some of the classes
Fixing button auto-centering on flash target
errant import
Guess I need it after all
fixed color swatch
.travis.yml: use spinehaxe instead of spinehx
Remove Bitdeli badge
FlxUIState: Added "createUI" function so you can load xml into your own custom classes that extend FlxUI
FlxUI: Removed awkward/ugly conditional headers for liveFilePath in constructor.