Expand support to include mime-types 3
Expand support to include mime-types 3

The tests pass locally. Built on top of #303 because the tests are failing for
reasons other than mime-types changes.

zillou/cucumber-rails,cucumber/cucumber-rails,Kosmas/cucumber-rails,cucumber/cucumber-rails,cucumber/cucumber-rails,Kosmas/cucumber-rails,zillou/cucumber-rails