[WIP] Starting implementation of better support for old versions.

Compatibility for older versions of android. Currently a work in progress and not finished.

Still missing:

- [x] Use ActionBarSherlock in detail views and webviews
- [ ] Use Fix bug where app crashes on old versions (API Level 8 at least) with messages about missing drawables.
- [x] Re-add search-functionality
- [ ] Re-add click-to-open-drawer