Simplify buildsystem.
Bind crypto_box_* family of functions.
Bind crypto_hash_* family of functions.
Bind crypto_scalarmult_* family of functions.
Bind crypto_verify_* family of functions (used internally).
Bind crypto_sign_* family of functions.
Bind crypto_secretbox_* family of functions.
Bind crypto_stream_* family of functions.
Bind crypto_auth_* family of functions.
Update README.
Update to use the new zero-copy ctypes interface.