test installed version instead of local dir
develop (not install) ckan itself
add MANIFEST.in for templates and json files
test: use import instead of file path
date_to_db converter has been removed, use remove_whitespace for test

Conflicts:
	ckanext/scheming/tests/test_validation.py
test coverage only for scheming
Merge pull request #5 from open-data/test-install

fix files missing from setup.py install
failing tests for plugin subclass
allow subclassing SchemingDatasetsPlugin
Merge pull request #6 from open-data/test-plugin-subclass

Allow subclassing plugins to override methods
add is_fallback method to scheming mixin
add test ini files to manifest
Merge branch 'master' into presets

Conflicts:
	ckanext/scheming/plugins.py
	ckanext/scheming/tests/test_dataset_display.py
	ckanext/scheming/tests/test_validation.py