Organic groups updated and job posts no longer issue notification emails

i have upgraded OG today. There were some major under the hood changes, so please watch out for bugs.

As part of the new features, I disabled email notifications for job posts. This is based on feedback that they were "taking over my group.". If a group admin wants to deemphasize them in the web presentation, she may do so using the new group Pages feature. I will be adding the ability for a group admin to remove arbitrary content types from the list of 'Create' links in the group block. That would effectively remove 'job' or other content types from the group.