2013-03-07 Included testing module accidentally excluded from previous
           releases.

2013-03-05 Improved and slightly expanded documentation, including
           docstrings. Changed keying slightly to allow for caching
           of more diverse types of functions. Created LifetimeError
           for negative or zero lifetimes when creating an FSCache.
           Released 0.9.9.

2013-03-04 Intial release 0.9.8.

