Adding Users, Clearing Search forms, Correcting Search, UI tweaks

+Search was returning all results that matched the name, regardless of
usertype. If you had a judge and participant with same last name, it
would return both on either tab and the others as well. Added usertype
parameter to queries to fix.
+Implemented Clear buttons for search forms - just refreshes page
+Implemented "Add [usertype]" buttons on projects and manage users tabs
+Minor UI tweaks to hero-unit and registration/add user forms