include testing program
looks like trick helps rarely with gcc and disturbs clang
include api section in header
include Murmur3 in a test
add siphash to test
change MurmurHash3_x86_32 signature to be a bit faster
fix makefile
optimize test a bit (surprisingly helps to Murmur3)
rename test.c to bench.c and add run_bench.sh
make clang happy

clang does something strange with fh_u64_t when compiles on x86_64.
Also, clang not as good at instruction reordering as gcc.
some improvement on bench
decrease amount of piece testing
fix building murmur with clang -O1 :(
add lookup3
bench_all.sh
fix Murmur3 performance for gcc
add lookup3 to run_bench
...
bench_src.c: call each function once for better inlining
fix bench_all.sh