VBVenue Model

Closes #19

- Implements VBVenue Model Subclass
- Corrects PFObject subclassing to conform with PFSubclassing protocol
- Adds dynamic fields for VBUser and VBVenue
- Registers subclasses with parse at app startup
- Adds asynchronous methods to check in as a user, and fetch checked in users as a venue (one to many)
- Adds test for current user
- Adds test for the anonymous user
- Adds user count method
Merge pull request #25 from azoff/19-feature-venue

VBVenue Model
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