Start validating slugs; better error notification to come
Create a mixin for handling form errors
Merge branch 'staging' into slug-field-validation

Conflicts:
	src/planbox_ui/jstemplates/profiles/profile-details-admin-tpl.html
Set validity message when fields are invalid
Add validity messages to profile details view
Merge pull request #104 from openplans/slug-field-validation

Slug field validation