Merge tag 'v0.10.1' of https://github.com/tedivm/Stash into HEAD

Version 0.10.1
FIX: allow the FileSystem driver to configure the key hashing function.
FIX: throw an exception when the key hash function does not exist instead of defaulting to md5.
Add test for keyHashFunction option in the FileSystem driver, test for success and for the exception.
Add test to check that directories are created using the key hash function.
Merge pull request #62 from pwhelan/win32fixes

Allow configuring the key hash function for the FileSystem driver