Nodes can now be shared with /nodes/<node_id>/share endpoint.

A POST will create a short link (if it doesn't exist already), whereas
a GET will return the short link for the node.

The endpoint will return a dict like:

{'short_code': 'XXXXXX',
 'short_link': 'https://blender.cloud/r/XXXXX',
 'theatre_link': 'https://blender.cloud/r/XXXXX?t'}

requirements.txt

@@ -30,6 +30,7 @@ zencoder==0.6.5
 pytest==2.9.1
 responses==0.5.1
 pytest-cov==2.2.1
+mock=2.0.0
 
 # Secondary requirements
 Flask-PyMongo==0.4.1