Introduce invitations router
Sent an email invitation
Add unique token to invitation
Send invitation email
Set notice flash message
Sent emails in development mode for demo purposes
Validate uniqueness of email
Merge remote-tracking branch 'origin/2.0' into feature-admin-invite

Conflicts:
	Gemfile.lock
	config/routes.rb
	db/schema.rb
Merge 2.0 features
Merge 2.0 with new changes
Merge pull request #14 from kabisaict/feature-admin-invite

admin invite