Favorite Article Support [Part 1 / 2]

- Created SQLite database for favorite articles
- Created article methods linked to this
- Article fragment action click calls this
- Got rid of old article category attribute
- Manual refresh shows progress bar on feed
Favorite Article Support [Part 2 / 2]

- Finished up the isFavorite() call from article objects
- Added "contains()" method to FavoriteDatabase
- Option to unmark favorite articles
- getFavorites() API
- get() API also looks in favorites, if available
- You can now get favorites from the usual get(url) method
- Skip loading on favorite article requests
- You can no longer extend the Request class
- Favorite button in feed is now functional
- Icons in ArticleFragment now indicates favorite state
- New "Mark All Read" and "Remove All Favorites" menu in Feed
- Renamed feed menu from main.xml to feed.xml
- Optimized all images to reduce apk size