Merge pull request #13 from btmills/master

Fix crash on empty table cell select
[Issue #12] crash was due to legacy code in numberOfRowsInSection method. Fixed.
Added basic UI for front page voting - long press a cell
Only longPress one fronPageCell at a time
UI considerations for not being logged in and longPressing
Voting UI fixed up and votedForDictionary added to Singleton/Defaults