Appraisal

Two 3.2.x compatibility fixes were necessary; see b4b21a9. The travis run should now be green.

3.2.x also required a bit of hacking the `spec/dummy` app, because of Rails application configuration changes; I gutted the `eager_load_path`, cuz otherwise 3.2.x would *always* load the `Uncacheable` class and bomb out on boot.
Shoot, may have forgotten about this case when deciding on the behavior of (cache: true, find_or_create: true). I still think we chose the correct behavior, as caching all paths would allow repeated unique 404s to exhaust available memory.