Add url property to models (close #36)

Starts down the path of URLs generated from models, which actually meant
using models (rather than raw API responses) across more of the app.
OCD cleanup
Show venue photos in search view (close #24)
Change global name
Don't mark unprivate properties as private
Add note about weird "isFullObject"
Make outdated check a bit nicer
Merge pull request #47 from tofumatt/urls-in-models

Add url property to models (close #36)