Revert "Call process in test helper as required in the specific rails version to avoid deprecations as of rails 4."

This reverts commit 17c0558d97ce742c8ef4c5ffa9f9d402be9885c2.
Move action_is test helper to controller helpers.
Add support for strong parameters that are included in rails 4.0.0.
Do not handle strong parameters if not defined (e.g. in rails versions older than 4).
Merge pull request #70 from direktzu/add_strong_parameters

Adding usage of strong parameters when running rails 4