Basic subreddit loader is in place
Refactored SubredditLinks adapter and loader into different packages/files
Fix subreddit picker not showing on first click of action bar
Added swipe to refresh on subreddit listing
Merge remote-tracking branch 'origin/master' into dev/mn/style_links

Conflicts:
	app/src/main/java/com/nguyenmp/reader/SubredditLinkListingFragment.java
	app/src/main/res/values/strings.xml