Roku current app (brentahughes#3)

Updated the application object to use the get method so it will default without error

Merge pull request brentahughes#2 from bah2830/ROKU_CURRENT_APP

Updated to return the application object

Updated with several pull requests from upstream repo

Merge pull request brentahughes#1 from bah2830/ROKU_CURRENT_APP

Added query to get current running roku app