Remove duplicate permissions (bug 1071971)
Bump marketplace-constants
bump to fix setup.py
Add in API to alter canned responses (bug 1063743)

Also moved a couple of existing reviewers serializers to the appropriate file.
Merge pull request #2580 from diox/api-canned-responses

Add in API to alter canned responses (bug 1063743)
Merge pull request #2583 from JaredKerim-Mozilla/1071971

Remove duplicate permissions (bug 1071971)