Adding username and password authentication, failes for some reason and added an ticket at TMDB API http://tmdb.lighthouseapp.com/projects/83077-api/tickets/358-improve-authentication-api#ticket-358-8.

I suspect the api_key has to be ignored from the request as the request matches the earlier discussion in this ticket,
but this would require extra work and actually doesn't make sense as all other authentication requests do require the api_key.
Merge branch 'develop' into feature-username-password-authentication
Merge branch 'master' into develop
Removing version because it does not exist at travis.
Merge branch 'master' into develop
Adding clear list functionality, fixes #22 and thus can be closed.
Fixing issue when the response from TMDB is null.
Adding airing_today and fixing tests for on_the_air, fixes #23 and thus can be closed
Make sure any __toString modification meets the requirements.
Adding CHANGELOG.md
Improving the way https is enabled.
Typo
Adding timezone first citizen for API
Adding test
Implemented Timezones first citizen, fixes #19.
Implemented first citizen for GuestSession's, fixes #20
Complying with the API.
Adding the username and password authentication method for authentication.
Removing hardcoded log paths from the examples.
Adding videos method on the API scope.