Suggest some institutions on a blank search refs #950
Added configurable limit for users in an institution #refs 955
Several enhancements to look and feel of institutions and management
Ensure users have an institution when registering refs #954
Correctly skip validation of admin in db.seed
Adding possibility for admin to change the user institution refs #1058

Still need to investigate if there should be something more in the controller to prevent mass assignment
Correct user approval and use better error messages
Correct some simple stuff as pointed out in the pull request comments
Merge pull request #1 from lfzawacki/mconf-web@branch-v2
Institution can't be required for new users

It could be required when a user is registering himself, but we have several
other cases where it shouldn't be required:
- when an admin is creating a user
- when a user is created after signing in via shibboleth
- when a user is created after signing in via LDAP

refs #954
Improve UsersController#approve and its tests

More detailed error messages, fixed failing tests and added a few more for the
new logic added.

refs #953