Updated contributor information
Removed the user capability check

I was getting php errors for this when editing a page. One solution
would be to check for current_user_can('edit_page'), but this wouldn't
work if users had created custom capabilities or roles for custom post
types, so I decided to drop the check all together.
Removes any revision post IDs from DB when plugin is updated

I didn't want to verify the main post ID because with the way the old
plugin was coded revision IDs got stranded. We can not be positive that
the post is currently intended to be hidden just because there is a
revision ID in the array. If the post was excluded, then updated and
un-excluded, the revision ID would remain, but the post ID would be
gone. It is better to simply remove all revision IDs as they are not
what is being used for displaying the navigations/menus anyway.
Merge pull request #2 from earnjam/master

Added Check for Revision IDs from previous plugin versions and fixed a bug