Oauth logger and bug #86

Made an Oauth logger into the project, which will log the authentication processes into a file or to the console. By default it is switched off, using only for development. The bug #86 (closed) was happening due to a lot of token refreshing call at startup. Reduced these calls, but concurrent token refreshing calls can cause problems in the future. On app start, the NetworkHandler won't refresh the tokens, the get_message_count does that instead.