Apply patch to allow for fetching of cached +false+ values.

Rails bug report:
https://rails.lighthouseapp.com/projects/8994/tickets/3482

Patch source:
https://rails.lighthouseapp.com/projects/8994/tickets/3482/a/323835/dont-interpret-false-as-cache-miss.patch
Merge pull request #2 from paperlesspost/dont_interpret_false_as_cache_miss_patch

Apply patch to allow for fetching of cached +false+ values