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 ).
Typo in example
Fixing more typo's
Adding features block in README.md
Merge branch 'develop'
Adding credit_id
Allowing to input the file_path's in string format in the ImageHelper methods `getUrl`, `getHtml` as this helper should also support the array approach.
Merge branch 'develop' of github.com:wtfzdotnet/php-tmdb-api into develop
Modify behaviour of the ImageHelper, which now supports string input, and adding missing credit_id parameters in cast and crewmember objects.
Adding psr/log interfaces to the require block of composer.
Merge branch 'master' into develop
Adding examples for companies.
Adding examples for changes.
Adding examples for collection.
Adding example for configuration.
Adding examples for discover.
Adding example for find.
Adding examples for genres.
Adding example for jobs.
Adding examples for keywords.