- Added crypto_aead_aes256gcm_*()
- Added crypto_box_seed_keypair()
- Added crypto_sign_ed25519_sk_to_curve25519() and crypto_sign_ed25519_pk_to_curve25519()
- Added compare()
- On PHP7, make memzero() and increment() avoid zeroing an object if it is not a reference or if its reference count is > 1