There is now a new option in the settings for an institution to
confirm registrations. When this is set, a new user admitting
themselves to an institution is required to complete an extra step
during registration, where they must provide a "reason" for their
registration.

After email verification the user must wait until an administrator
approves or denies their registration before they can properly
access the site. For the administrator, this is done via a new
admin page under Institutions, called "Pending Registrations".

Change-Id: I2bd68e39a9f4ef89f350ac573d8232f342de6fdc
Author: Stacey Walker <stacey@catalyst-eu.net>
Signed-off-by: Brett Wilkins <brett@catalyst.net.nz>
Signed-off-by: Darryl Hamilton <darrylh@catalyst.net.nz>