Update Bootstrap/jQuery libraries.
Reformat and optimize custom CSS.
Update HTML to match bootstrap 3.x.
Fix barbutton/windowTrackers bugs.

- Fix Addon problems when reinstalled/updated.
- Add windowTracker for urlBarButton.
- ignore about:* pages while tracking tabs.
- remove showForPage and replace it with native tabs[activate/ready].
- update css/HTML to match bootstrap 3.x.
Update version to 0.4
Regenerate XPI.