Removes templates_legacy and broken tests

- Removes the entire templates_legacy folder
- Removed any tests that depended on the legacy templates, these are
  mostly in functional.
- Added a warning to update_config() that genshi support is deprecated
Merge branch 'master' into 1772-delete-legacy-templates

Conflicts:
	ckan/tests/functional/test_package.py
Merge branch '1772-delete-legacy-templates'
Merge branch 'master' of github.com:ckan/ckan