ContactViewController for viewing contact details in popover
contact cells with names and positions in building view
Merge branch 'master' into charlie
Exposure View Controller subclass of BuildingViewController
updated UX for loading building info by tapping on building markers on map
cleaned up loginVC, AppDelegate and BuildingVC
cleaned up ExposureVC
Updated street view panorama view for cached images
to allow for merge
First version of caching street view images. Major bugs: 1)  Unoptimized, saves images everytime popup is closed, causes big performance issues and 2) if internet goes down, app must be stopped and restarted for cached images to appear