Basic VBCheckinController with placeholder data

Re:issue #21

- Initial skeleton for controller
- Handle location detection and alert prompts for invalid location states before fetching venues
- Setup with basic test data for displaying in table

Another independent push that doesn't affect any existing files and lays down the framework for the VBCheckinController.

Next steps are to fetch the actual data from foursquare, and link in with the flow of the other controllers.