jiffy sometimes returns iolists
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Bump for new version containing a few bugfixes.

Closes #61, Closes #60
CAS is always 0 for append/prepend

Added comment

No flags for append/prepend

Closes #59, Closes #63
Return {ok,CAS::integer()} instead of ok for all store operations.

This saves a roundtrip when you set/add an item that you'll want to modify later.

This is a backward-incompatible change, but it seems important enough and seems to be
a coding oversight as most of the work was already done (but thrown away) in store_callback().