Subreddit list now effectively uses cache.
In order to refresh, we have to manually do it (except when we log in).
Earlier it won't refresh/load properly during orientation change.
Fixed that with help of http://stackoverflow.com/a/3821998/360844
Fixed bug where clicking Diode icon in PickSubredditActivity was resulting in crash.
Merge branch 'shobhitg' into master

Conflicts:
	src/in/shick/diode/reddits/PickSubredditActivity.java
Cleaned up formatting in PickSubredditActivity
Added front page to default subreddit list
added ctags to gitignore
version info for 1.0.9
made caching more consistent

Cache update time comparisons are now done against the absolute value of the
time delta.  If a device were to get set back a year in time for any reason
previously, caches would not be updated for a year.