Add test suite for the Sort class
Add test suite for the Subtitles class
Add test suite for the Summary class
Add test suite for the Text class
Add test suite for the Title class
Add test suite for the To class
Add test suite for the ToId class
Add test suite for the Value class

Fix the constant for the value parameter name.
Update Request constructor visibility and restrict addParameter to extending classes
Add hashCode, equals and toString in Parameter class
API is out of beta, and the version parameter is required

Also add hashCode, equals and toString to Request class
Add test suite for the EpisodeDisplay class
Allow EpisodeDisplay request to take the subtitle parameter