test(docs): add a `make test` target
chore(controller): update djangorestframework to 2.3.14

Several months of cleanup and bug fixes to a core Deis library:
https://github.com/tomchristie/django-rest-framework/compare/2.3.13...2.3.14
fix(builder): don't reload cedarish if its already loaded

Ref #1643

Also add log messages
Merge pull request #1645 from deis/builder/dont-reload-cedarish

fix(builder): don't reload cedarish if it's already loaded
Merge pull request #1648 from mboersma/1646-docs-make-test

test(docs): add a `make test` target
Merge pull request #1586 from mboersma/update-django-rest

chore(controller): update djangorestframework to 2.3.14