Adding study class, controller and services to manage study description
Adding study text in cutting room page
Updating display text and change it to Cut-up-room text
Merge pull request #84 from OxBRCInformatics/feature/75_arbitraryText_ConsentStatusPage

Merging in. It would be nice to change the following from this once we've released:

* Rename "study" things to something more apt for the arbitrary text.
* Move integration tests to unit tests and add mocking.

Other than that :+1: