add method to fetch all the clients and their descriptions
when the client is verified check all existing authentications. If any minecraft account exists with the same username but a different UUID all assosciated authentications are nullified and the description/icon are reset
remove the description listing, not required
no longer null the names for users when logging in with an already used minecraft name, handled at verification level now
remove the minecraft account too when we remove the authentication
Merge pull request #15 from Eluinhost/features/nullifyOldAccounts

Nullify old authentications on minecraft name with new UUID