Now providing usage history for last 3 days.
Added header into details page in tracker.
Merge remote-tracking branch 'origin/dev'
Removed unused import.
Fixed typo.
Added search into tracker.
Fixed search
Added API app prototype
Added message about update frequency into app details in tracker.
Improved templates in API app.

Now displaying more information.
Now syncing supported API list with an API key.
Changed name of a manage.py task that updates list of apps. Updated its functionality (now updating app's name).
Updated styling of page titles and some strings.
Added full URL into page with information about API method.
TODO
Updated README.md
Fixed app list sync management task by catching all exceptions.
Chart in tracker is now displayed using Highcharts library.
Added static "about" page.
Added attribute that specifies if app is trackable or not.
Removed details page from tracker. All information can now be viewed on the index page.
Updated "about" page contents.