Let << and >> operators receive an UintX as argument
Add MD5 to registry test
Implement SHA-3

fixes #45
Refactor or RIPEMD-160
Implementation of RIPEMD-128

fixes #45
Implementation of RIPEMD-256

fixes #45
Implementation of RIPEMD-320

fixes #45
Add all known HMAC sizes
Accept UintX's as argument to clip and coerce
Implementation of Tiger

fixes #45
Implementation of Whirlpool

fixes #45