discussions/show.html.haml: replace permissions check with cancan
discussions/show.html.haml: replace permissions check with cancan

travis-repos/loomio,rafacouto/loomio-bak,podemos-info/loomio,podemos-info/loomio,podemos-info/loomio,rafacouto/loomio-bak,rafacouto/loomio-bak,travis-repos/loomio