Merge pull request #116 from ollieh/master

Added receiving, sending, displaying, and logging of chat messages
Populate tox friends list on start
Add/Remove friends from tox friend list as well
Fixing logic
Fix crash on bootstrap connecting
Delete Friend properly
Stop redownloading DHT nodes constantly and fix crash on delete
Hopefully fix sending messages
Update README.md
Fixed not reconnecting to friends after restart, by readding friends to toxcore friendslist from the sql database after restarting.