Created constants for saving/unsaving a submission.
Implemented save (with and without categories) and unsave.
Added tests for save / unsave.  Unsure about the category save at the moment.
Implemented save (with and without categories) and unsave.
Removed empty test.
Added save and unsave to 'implemented'.
Merge pull request #68 from jonnykry/master

Implemented Save and Unsave from Submission