Refactor IconType in
-IconType (abstract class)
-GlyphIconType

-FontAwesomeIconType
-OpenWebIconType

Use "null" instead of IconType.NULL.
Add GlyphIconType class!
Merge remote-tracking branch 'upstream/bootstrap3' into bootstrap3
Correct URL for GlyphIcon :
http://getbootstrap.com/components/#glyphicons
Merge pull request #275 from tahitiangabriel/bootstrap3

Bootstrap3 : IconType refactor