Implemented nav controller, buildings

Need to:
clear text on back
headers
get building picture/info
fix mvc structure
organize views/models
added a new file
detailed information set up
buildings populated, image populated, need to work on minimum zoom scale for image
app has been finished
Display all buildings or only buildings with photos, saves user defaults

need to work on :
-archiving
-enabled/disabling zooming
Zoom images togglees on and off
app now archives sorted need.

need to:
-clean up NSLog's
-comment
-add color
app has been finished successfully, ui modified, archives
Merge branch 'Preferences'