Move post contents API and workspace API to /users/contents
Merge pull request #23 from Connexions/rename-contents-url

Move post contents API and workspace API to /users/contents
Respond to OPTIONS with CORS headers
Add Access-Control-Allow-Headers and Access-Control-Allow-Methods
Change example allow origin to http://localhost:8000
Merge pull request #24 from Connexions/respond-to-options

Respond to options
allow for a dynamic list of allowable origin hosts
Merge pull request #25 from Connexions/multi-origin

allow for a dynamic list of allowable origin hosts
subset content for workspace return
Merge pull request #27 from Connexions/reduced-workspace

subset content for workspace return
Refactor derived from mocking code in functional tests
Add PUT /contents/uuid@draft.json test for derived content
Save resources when deriving a copy from archive
Add test for validating media type
Add subjects and keywords fields
Merge pull request #28 from Connexions/fixes

Fixes for more complete model