Add Base64 test
Add Base64 test

As noted in the module description, this test currently fails because of extra
NULs at the end of decoded strings. More work needed to find where these are
coming from.

darcs-hash:20071105005312-19166-c4aba82bb6fcfc3e6e73a41abf7550b362fbc7a4.gz

phonohawk/HsOpenSSL