general cleanup. plus, got the layout started for the edittidbyt
took care of usernames to only allow letters, numbers, and underscores.
changed the recording prompt to a dialog. disallowed line breaks in
tidbyt descriptions
made some changes to the record location. if user selects current
location, it says enable gps for current location. if they select the
other location, but haven't long pressed the map then it tells them to
do so.