Bugfix: Correct USE_SHA256D macro name to ensure SHA256d is always preferred as default algorithm
Keccak: Import algorithm code as-is
keccak: Adapt for BFGMiner
opencl: Add Keccak support
opencl/keccak: Unroll all the hash rounds properly
opencl: Add non-goffset support to Keccak
Travis: Update with Keccak
Keccak: Include support in various builds
keccak: Adapt opencl intensity interpretation to have approximately the same desktop interactivity affect as SHA256d
opencl: Eliminate keccak_prepare_work
Keccak: Simplify keccak_hash_data