Add examples of usage fixedWidth on Icons

- Update version to 0.9-SNAPSHOT for new development cycle.
- Changed setSubtext() -> setSubText() on TypographyView to reflect
  this change of Heading widget in GwtBootstrap3 (0.8.1 and 0.9-SNAPSHOT).
- Added examples of usage fixedWidth on Icons to IconView and NavView.
Merge pull request #40 from zlamalp/fixedWidth

Add examples of usage fixedWidth on Icons