poll can be created by only adminstrator

reference-> code4aap/swaraj.commons#28

Only adminstrator can create a poll , and AUTH user can give vote in poll node
and in groups landing page
remove voting points (user points) in poll contain type
Merge pull request #33 from akashjain132/issue28

poll can be created by only administrator

references code4aap/swaraj.commons#28