Cleaned up NavListArrayAdapter
Added icon for checkin
Switched MapView and CombinedMapNewsFeed fragments (home now takes you
to the combined one)
Added new backgrounds, buttons, and items to discussion containers (in
the newsfeed)
Clicking on the header hides the listview fragment by using . Pressing
back will bring the fragment up again. (slightly glitchy, needs to be
cleaned up in the onbackbutton because some of it isn't working.)