[ADD] added selection highlighting to the pins
[ADD] added button graphics and an indication view for network errors
[ADD] added completion blocks to all network activity, added alert for username/password, finished up the credential checking process
[ADD] storing credentials into the keychain on success - showing the username in the server overlay (also the password state)
[CHANGE] cleaned up server list a little, added failure alert if credentials could not be verified
[CHANGE] bound the swipe allowance to the right thing