Remove character counter code from package (closes #75)

This should be reimplemented using collective.js.charcount. We still need to add an upgrade step to fix registries
Merge branch 'master' into issue_75

Conflicts:
	CHANGES.rst
	src/collective/nitf/profiles/default/cssregistry.xml
	src/collective/nitf/tests/test_views.py
Add upgrade step for removing character counter code

- Unregister CSS and JS resources associated and cook them again
- Remove control panel records from registry
- Refactor test to make them easier to understand
Merge pull request #96 from collective/issue_75

Remove character counter code from package (closes #75)