adds intent to get audio/image/video/files when the send file button is pressed
+receive the data on main_activity, figure out the selected file and its type
Merge of master Astonex/Antox
prototype message with picture/audio
+icons for play/pause audio
make friend request notification actually remove itself on tap
remove another chance of nullpointerexception
Merge pull request #168 from dethstar/master

adds intent to get audio/image/video/files on longClick send file action