Merge branch 'master' into develop
Updating README
Adding BackoffRetryPlugin from Guzzle.
Adding logging functionality, requires monolog to be installed.
Fixing some issues
Small issues / improvements.
Fixing unit tests of Network
Removing deprecated Tv\Network class, TMDB moved this up to a top resident.
Fix references
Updating travis ci for php 5.6 and hhvm.
Updating README
Cleaning up some aspects of the API, as removing the TV\Network class and moving it into it's first citizen class Network ( since TMDB added this ).

Also added travis support for php 5.6, and hhvm ( not officially supported though ).