nesquena/rabl — pull request #569 by t-k (2014-06-26 11:02:39+00:00)
Title: fix cache for Non-Rails app

It seems from RABL version 0.9.0, cache doesn't work on Non-Rails app (e.g., Sinatra).
"NameError: uninitialized constant Rabl::Engine::Rails" raised.

Enabling cache on "fixtures/sinatra_test/app.rb" will reproduce this error.
This patch fixes this problem and enables cache on sinatra again.