Merge branch 'master' into Danny
Fixed API 9 support and some layout changes

Running the app on API 10 crashed due to a layout file using an
attribute that exists only in API 11 and above. This was fixed by
creating a copy in values-v11 and removing the attribute in the
original file.

MainActivity now has drop down menu to change the default sort for
submissions.

Successive user login/logout doesn’t create a clean blank state and
seems to maintain some session information. This hasn’t been completely
fixed yet (sometimes user needs to completely close the app). This is
likely linked to the Apache HttpClient, but further investigation is
necessary.
Subreddit list side menu integration
Submissions list sorting now works.
Merge branch 'Danny' + conflict fixes

The subreddit select and update code wasn’t working well with the
integration to the drawer menu and has been fixed.

- SubredditFragment now has a reference to
OnDrawerMenuInteractionListener which may need to be changed later if
we decide to display the SubredditFragment elsewhere.
SubmissionListFragment has been updated with a refresh(String
subredditName, SubmissionSort sort) method that clears the current
submissions list and refreshes with the selected subreddit and sort.