WIP: Symmetric crypto

[yilinwei]

Supersedes #115

[armanbilge]

Suggested change

	@js.native
	private[bobcats] sealed trait AesCbcParams extends Algorithm
	private[bobcats] object AesCbcParams {
	def apply(iv: js.typedarray.ArrayBuffer): AesCbcParams =
	js.Dynamic
	.literal(
	name = "AES-CBC",
	iv = iv
	)
	.asInstanceOf[AesCbcParams]
	}
	private[bobcats] sealed trait AesCbcParams extends js.Object with Algorithm {
	val name: String
	val iv: js.typedarray.ArrayBuffer
	}
	private[bobcats] object AesCbcParams {
	def apply(_iv: js.typedarray.ArrayBuffer): AesCbcParams =
	new AesCbcParams {
	val name = "AES-CBC"
	val iv = _iv
	}
	}

[yilinwei]

Some of the .rsp files are absolutely massive, I like the approach but I think that we'll just take a few of the test vectors. We're checking the plumbing after all; not the actual crypto.