Some bugfixes, 'Last Readed' and highlights in searches.

- Changed feed deactivating condition in update_feed() function.
- Fixed the Preferences controller and its view.
- Fixed problem with the Timezones.txt file and the minifier.
- Now highlights the words found in a search.
- Javascript won't try to load posts when the scroll goes down and there's no feed selected.
- Added 'Last readed' to the Highlights list in the main view.
- Updated framework.