Fix #157 "Can't switch to any event year after..."

Fix #157 by updating the action bar's selected nav item when the user
selects an item.

But I'm puzzled as to why ViewTeamActivity#onNavigationItemSelected()
doesn't have the same bug. Does one of its listeners recreate the menu?
Merge pull request #172 from 1fish2/fix_157

Fix #157 "Can't switch to any event year after..."