Fix development.cfg to use zcml-additional-fragments.

See https://github.com/4teamwork/ftw-buildouts/pull/10
Implement uninstall profile.
Merge pull request #62 from 4teamwork/jone-uninstall

Implement uninstall profile.
Add uninstall method.
Merge pull request #63 from 4teamwork/jone-uninstall-method

Add uninstall method.
Install dependent products.
Fix raw github URLs to use githubusercontent.com domain.
Merge branch 'master' into v3.x

Conflicts:
	development.cfg
	ftw/book/configure.zcml
	test-plone-4.1.x.cfg
Uninstall: remove no longer used is_product flag.
Update uninstall profile with new features.