impliment open membership-requesting
Remove sign in banner
Merge pull request #852 from loomio/request-membership

Request membership
Merge branch 'master' of github.com:loomio/loomio into feature/start-group-sign-up

* 'master' of github.com:loomio/loomio:
  Remove sign in banner
  impliment open membership-requesting

Conflicts:
	app/mailers/invite_people_mailer.rb
subscription in pwyc info-box updated