CU Boulder User Invite v1.1

[timurtripp]

This update:

• [New] Enables selection of multiple user roles for an invite. Previously only one role could be selected.
• [New] Adds role descriptions, which can be edited in settings.
• [Change] Updates the description for the User IdentiKeys and Custom message fields.
• [Change] Changes the namespace of the CU Boulder User Invite settings.

Update hook ucb_user_invite_update_9501:

• Migrates the settings from the old namespace to the new one.

Resolves #6

Sister PR in: tiamat10-profile