SHA KAT generators.
sha2_64bit.js: Update goog.math.Longs in-place, rather than allocating
new ones repeatedly; update message schedule in-place. 20% performance
gain, Chrome 36.
crypt/sha12mc_test.js: Monte Carlo KATs for SHA-1, SHA2-224, SHA2-256, SHA2-384, and SHA2-512. (Note: this test takes a few minutes.)

shamcs.py: The Python script used to generate the KATs.