Add CollectionRoles Controller
Refactor ProjectPreferences to share with CollectionPreferences

Conflicts:
	app/models/user_project_preference.rb
Add Collection Preferences

+ Refactor Project and Collection linking
+ Close #295
Fix spelling, use build for create yeild
Merge pull request #300 from edpaget/collection_roles

Collection roles and preferences
Create Strong Params module
Install Json-Schema gem
Add JsonSchema Validator

Create json schema validator for subject set
Add request spec for json schema validation
Rename ClassificationSchemaValidator to ClassificationValidator
Merge pull request #301 from edpaget/json-schema

Json schema
Add Metadata to SubjectSet

+ Also remove protected_attributes
+ Closes #291
+ Fuck you rails 4
Merge pull request #302 from edpaget/subject-set-metadata

Add Metadata to SubjectSet