Merge pull request #268 from tahitiangabriel/bootstrap3

Bootstrap3 : Font Awesome cleanup
Refactor IconType in
-IconType (abstract class)
-GlyphIconType

-FontAwesomeIconType
-OpenWebIconType

Use "null" instead of IconType.NULL.
Add GlyphIconType class!
PR #212 Use wicket-jquery-selectors
PR #212 Remove Jackson dependency. It comes with wicket-jquery-selectors
PR #212 Remove Guava dependency
medium button size doesn't need any css class (fixes #270)
Fixes #271 - Fix the name of FontAwesome large icon type
Merge remote-tracking branch 'upstream/bootstrap3' into bootstrap3