Add PermissionGrid Options for Polls

[Ralkage]

In a future release, we would want to create some PermissionGrid options for polls so that the Administrator has control of what groups can view or actions they can perform.

Read

• [ ] View polls (maybe?)
• [ ] View poll results

Create

• [x] Start a poll

Participate

• [x] Allow poll voting
• [x] Allow self-poll editing

Moderate

• [x] Delete polls
• [x] Edit polls

If you have any suggestions on what names we should use or what permissions I missed, please discuss here.

[Shahiem]

The Delete polls and Edit polls permission are added for the new version