Pullquote saves now allow post saves

Tested (with and without regular content edits):
* 2 new pullquotes - result: both pullquote posts created, ids added in contents of post
* 2 old pullquotes with no changes - result: pullquotes retain ids, pullquote posts remain
* 2 old pullquotes with different pullquote contents - result: pullquotes retain ids, pullquote post excerpts were updated as expected
* 1 new pullquote, 1 old - result: new pullquote added and id added to contents, old pullquote retains id
Merge pull request #15 from borkweb/6268-quote-saving

Pullquote saves now allow post saves