Added utility methods to help with authorization
Added AuthenticatorServer
Added callback response page
Renamed AuthenticatorServer to Callback Server
Added google guava to dependencies
Added httpclient dependency
Added authentication methods
Minor modifications to authentication system
Made some changes to authentication
Added callback url
Added callback-related stuff
Added some stuff that my compiler produces to the gitignore

sorry about this, I'll try to remove it later
Made the sample app more useful
Started using new authentication system
Moved some stuff to Authenticator
Removed imports
Changed default callback to a method
Moved url parameter parser to Authenticator
Cleaned up CallbackServer
Fixed typo in Post