Added JSON Converter for Speaker
Minor
Created SpeakersController
Added SpeakersController to ServiceController
Added getSpeaker method to JavaScriptInterface

Updated MainActivity
Added Video class

Represents a single video
Added JSON Converter for Video
Added VideoController
Added VideosController to ServicesController (and implementations) and to JavaScriptInterface
Cleanup
Cleanup
Added DEBUG constant which changes data source URI

Also updated datasource
Updated Video object

Replaced uri attribute with YouTube ID
Removed imageWidth attribute from speaker
Handled errors caused by bad JSON