Fixed Purpose Video key.id issue

Also, Added Try Catch for Mastery if User doesnt have any prior records.
Will default to Zandar, and first path on player_progress API list.
Adjusted Error in Try Catch Condition for MasteryController
updated live ranking page
Merge branch 'master' of https://github.com/glenwks/genshyft
Merge pull request #41 from glenwks/master

Default Value for Current Mastery Progress