[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.
since you're wrapping another crashstorage instance, it is the needs of that wrapped class that are important.  However, you don't know anything about that wrapped class until runtime, so you must forward those two calls onto the wrapped crashstore.  

Thinking about it, I can make the same argument for the ```save_raw_and_processed``` call.  If you do not implement it, you may by-pass the efficiencies that the wrapped class implemented.