Reddit client sample

1. Uses retrofit to build API client
2. Uses SQLite to store cached data
3. Uses ContentProvider to retrieve data
4. Uses cache dir to store images

!!IN PROCESS!!

// ENDED TODO: // 1. Show comments // 2. Do voting // 3. Clean up refreshing posts (remove syncadapter, move to a service) // 4. Add auto-loading new posts when subreddit is running out of posts // 5. Login system (using android accounts?) // 6. Manage subreddits // 7. Nav drawer with view posts, manage subreddits, login, settings items // 8. Different layouts for landscape (image on the left, all the rest on the right) // 9. Make post cards fit into one screen and make only content within scrollable (?)