Working YSA importer
UTF fix.
Add allärs datasource.
Add alternative labels to categories.
Unfinished kulke category matcher.
Bugfix: remember to return saved category.

Necessary for parent / child relationships.
Bugfix: method call signature.
Textual category matching. Categories added for kulke events.
Merge remote-tracking branch 'tituomin/ysa'

Conflicts:
	requirements.txt