MurmurHash3

[Guillaume Chatelet via Digitalmars-d-announce]

The last version of the code is available here and is feature 
complete AFAICT
https://github.com/gchatelet/murmurhash3_d/blob/master/murmurhash3.d

Last concern, I declared blockSize in bytes where 
std.digest.digest says it should be in bits. Why does it need to 
be bits ? It looks like HMAC (which needs it) is explicitly 
making sure it's always a multiple of 8 bits.