made permissions accessible for admins and conference owners
Merge branch 'andrey'
refactored isAllowed into canRead and canWrite
refactored isAllowed into canRead and canWrite
Merge branch 'master' of github.com:asobolev/GCA-Web
Merge pull request #148 from asobolev/andrey

Made permissions accessible for admins and conference owners

LGTM. Closes issue #139