Added functions getExplicitCellWidth and getExplicitCellHeight to ImageAsset
- Fix AABB size with left or right text alignment

left or right text alignment should only pad the width, previously both width and height were being doubled.
Merge pull request #88 from capnlove/ExplicitCell_GetWidth

Added ImageAsset.getExplicitCellWidth and ImageAsset.getExplicitCellHeight
Merge pull request #97 from lilligreen/fix/ImageFontSize

Fix ImageFont AABB size with left or right text alignment
FontSize is now written out to TAML correctly.
FontPadding converted from U32 to F32, making it write out to TAML correctly as well.
Merge pull request #99 from capnlove/ImageFont_TAMLwrite

FontSize and FontPadding TAML export
Merge pull request #1 from GarageGames/development

Mac OSX 10.6 Support