Image tests:

- Add detect test
- Updated EXTENSIONS that image can render
Merge branch 'feature/player_update' of https://github.com/alexschiller/modular-file-renderer into feature/test_image

Conflicts:
	mfr/image/handler.py
	mfr/image/test_image/test_handler.py
Fix detect test
Merge pull request #50 from alexschiller/feature/test_image_detect

Feature/test image detect
Add test for collectstatic
Merge branch 'dev' of https://github.com/CenterForOpenScience/modular-file-renderer into feat/collectstatic
Remove mfrconfig.json
Merge branch 'feat/collectstatic' into dev
Add config module from flask
Add configuration error
Collect static assets in STATIC_PATH
Add docstrings
Rename config.py -> _config.py

Prevents clashing with mfr.config object
Use STATIC_FOLDER config value for collect_static destination
Update app.py to use mfr.config
Update README
gitkeep static folder
Merge pull request #51 from CenterForOpenScience/feat/config

Feat/config
Test changes and export requirements

- Add code detect and not detect test
- Update image detect and add image not detect test
- Update render/export requirements for code/image
Merge pull request #52 from alexschiller/feature/code_tests_and_cleanup

Test changes and export requirements