Add HMAC_SHA256 benchmark @ jsperf.com
Add HMAC_SHA256 benchmark @ jsperf.com

redmedical/asmcrypto-redmedical,meganz/asmcrypto.js,vibornoff/asmcrypto.js,savamura/asmcrypto.js,meganz/asmcrypto.js,meganz/asmcrypto.js,vibornoff/asmcrypto.js,Quiark/asmcrypto.js,savamura/asmcrypto.js,redmedical/asmcrypto-redmedical,Quiark/asmcrypto.js,Quiark/asmcrypto.js