Panlizer Patch to Refine Permissions

it is going to be added to panelizer, but it exposes the "allow panels
choice" to permissions, as opposed to anyone having access that can
edit the node.
Hotfix:  added README entry for panelizer patch
Hotfix:  README typo-fix
Merge pull request #52 from emmairwin/7.x

Hotfix: Panlizer Patch to Refine Permissions