Adding screensharing sample
Adding screensharing layout
Refactoring screencapture
Fixing screensharing menu name
Clearing unused code
Fixing unused imports
Removing token and sessionId
Fixing subscriber view
Adding subscriberToSelf to true
Adding reason parameter in droppedStream callback
Removing reason from streamDropped callback
Merge pull request #41 from marinaserranomontes/sample_screensharing

Sample screensharing