First half of invites framework for event editing. Related to #173.
Supports listing owner/editors/invited folks and sending the invite email. Does not support turning the invitation into an editorship yet.
Fully-functional editor invitation.
Working invitations for housemates.
Implemented removal of editors and housemates.
Removed branch-only migrations.
Merge branch 'master' into invites
Re-generated branch-only migration data.
Corrected handling of duplicate invitations.
Comma-separated lists of emails now trim, to allow leading spaces.
Whoops.
Help text updates.
Merge pull request #184 from littleweaver/invites

Invites