Use plone.app.testing instead of PloneTestCase
Test that contenttypes are in types_tool.
Test that browserlayer is present.
Test that stylesheet is in registry.
Deprecate using the UML model and AGX.
Update changelog.
Deprecate UML: Remove code-sections
Remove UML directory.
Remove AGX cruft from python files

Removed:
- end-of-class markers
- excesseive module headers
- "Methods" markers
- additional imports
pyflakes
Add 'test' extra in setup.py to require plone.app.testing.
Do not try to load non-existing AppConfig anymore.
pyflakes
Merge pull request #3 from collective/ditch-uml

Add some tests, ditch uml