Revise menu buttons
Don't save user's group when group_id is blank
Add criteria to form index
Add delete button for inquiries
Merge pull request #52 from kanety/inquiries

Inquiries
Remove disused module
Add creators and editable_groups to form
Fix redirect location
Join creators only when it's used
Fix typo
Add class to approval required form
Revert "Remove disused module"

This reverts commit 1a560ea2fb6e51ec9ffc7d98e444051fd19198ce.
Now raw_tags accepts nil
Highlight approvables
Keep in_editable_groups in case validation error, link check and accessibility check
Keep in_maps in case validation error, link check and accessibility check
Change list thumbnail condition