Support byte[] 64-bit MurmurHashing

Cherry-picked the support for passing a byte[] to MurmurHash.hash(Object) out to the hll_plus_plus branch and added analogous capabilities to the 64-bit code path.

The diff looks a little funny b/c much of the 64-bit code paths seem to have been added with tab-based indention, rather than spaces.  I chose to offer a minimal pull w/out reformatting the surrounding code.  LMK if this is a problem.