add LoginTask to LoginActivity
add authorization method for LoginActivity. start LoginTask
Switch everything over to actionbarsherlock library.

Modify all code to use actionbarsherlock library to support the
actionbar. HomeActivity has tabs for stories/questions/shouts. Each
respective Fragment is empty for now. The add button works as far as
opening the CreatePostActivity. We will have to retheme according to the
actionbarsherlock guidelines. Until we implement a tokening system for
logins we won't be able to add login functionality so we should work on
that next.
Merge remote-tracking branch 'origin/master'

Conflicts:
	AndroidManifest.xml
	res/layout/activity_home.xml
	res/values/strings.xml
	src/com/gauchoshout/android/ui/CreatePostActivity.java
	src/com/gauchoshout/android/ui/HomeActivity.java
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/com/gauchoshout/android/ui/HomeActivity.java
Fix some compile time errors that arose from merging. Add functionality
for about button.