make sure the bootstrapping is done
alert the user if no internet connectivity
delete corresponding chat of a deleted friend
Stop app crashing when selecting friend before START_TOX
Merge pull request #136 from strider29/master

Bootstrap check and delete log chats

Make sure the connection to a bootstrap is done after the nodes have been downloaded. Also delete the chat logs when deleting a friend.
Should fix QR image mismatching your actual key
Add exclamation mark on new message