change license to apache license 2.0
change license to apache license 2.0

wg/scrypt,offner/scrypt,haochenx/scrypt,wg/scrypt,wg/scrypt,haochenx/scrypt,fissara/scrypt,hegjon/scrypt,hegjon/scrypt,offner/scrypt,fissara/scrypt,hegjon/scrypt,haochenx/scrypt,fissara/scrypt,xoom/scrypt,offner/scrypt,xoom/scrypt