Frontend issue 927 is now fixed, so the tag.create endpoint can be used.
The tag.create endpoint doesn't return the newly created tag - it is invisible, since it has no photos.
Ensure tag endpoints are correctly escaped
Tag test updates.
Can't find a way of testing tag.update, since there are no updatable tag fields.
Tags with slashes work
Tags with double slashes don't, but at least they're no longer undeletable.
Merge branch 'master' into apiv2_tags
Merge branch 'master' into apiv2_tags

Conflicts:
	openphoto/objects.py
	tests/test_tags.py
Merge pull request #28 from sneakypete81/apiv2_tags

Changes due to photo/frontend tag bugfix