Return version and content_language with workflow
Reject classifications without required metadata
Fix Controller versioning examples
Add versioning specs to versioned controllers
Rename sort random to sort cellect

closes #257
Merge pull request #272 from edpaget/rename-random-to-cellect

Rename sort random to sort cellect
Merge pull request #265 from edpaget/add-workflow-version-to-classification

Add workflow version to classification
Merge pull request #270 from edpaget/add-versioning-spec-to-controllers

Add versioning spec to controllers
Add priority to set member subject table
Remove SetMemberSubjects from Subject Controller
Add Set Member Subject Controller

Closes #268
Extract subject response to seperate method

Correct context names in subject controller spec
Fix spelling mistakes
Merge pull request #271 from edpaget/add-priority

Add priority to Set Member Subject