remove timeout gem
handle invitations where group is not available anymore (ie: drop them)

continue destroy when membership.group is nil
Fix motion time select
Merge pull request #736 from loomio/bug/close-time

Fix motion time select
Merge branch 'master' of github.com:loomio/loomio into refactor/css-overhaul-groups

* 'master' of github.com:loomio/loomio:
  Fix motion time select
  handle invitations where group is not available anymore (ie: drop them)
  remove timeout gem