[DO NOT MERGE] fix bug 1075700 - add crypto pass-through crash store

r? @lars - @peterbe and @lonnen should look too if you have time.

Putting up for review/discussion, but please don't merge yet pending some further investigation of the ```simple-crypt``` package being used here.
you can just decline to implement this method.  The base class implementation will call your ```save_raw``` and then your ```save_processed```.  It is to be overridden iff there is a more efficient way to do them both at the same time.