Update to CKEditor and adding Image Manager

Just a few comments...

I've changed CKEditor so it edits inline now because the latest version 4.0 supports that.  I think it looks much nicer like that although there could be some catches I'm not aware of.

For the file manager I needed a newer jQuery version, so I've added a conditional into the header so it uses a newer version just for the file manager.  Once we update the global jQuery file this can be removed.

I'm using an image cache folder for the file manager thumbnails, however these files never get deleted unless you do it manually.  Wasn't sure what the best way to handle that was without checking each file on the page load.