Updates VBCaptionController

Re: #22 

- First integration of voice recognition for dragon SDK
- added table view for history of messaging
- Initial refactoring and creation of VBInputSourceManager
- Cleaned up code preparing for push
- added toggle between two presentation types and more readable history in the table view
- added camera view; removed table view and added label for caption history
- added pan gesture recognizer for swipe
- Added swipe gesture to switch between caption modes