Checkin Controller Polish

Closes #21
    Child #70 (Merge Dependent)
    
    - Adds Venue data source for table views
    - Refactors Check In controller
    - Adds title, new labels, and table view to xib for checkin controller
    - Tweaks to VBWelcomController layout
    - Adds custom table cell for displaying venues
    - Adds caching policy for user count queries
    - Adds custom data source for the venue table view
    - Moves AppDelegate to the Delegates folder
    - Adds custom delegate for the venue table view
    - Adds checkmark asset to project
    - Adds separator color for UI Table Views
    - Adds indeterminate progress indicator for VBHUD
    - Adds done indicator for VBHUD
    - Balances transition calls in VBRootController
    - Increases limit to 50 on Foursquare venue search query
    - Adds Venue Table View Cell