Remove 1mod8

https://github.com/WhisperSystems/TextSecure/commit/27b5bf54cc2ddd809eedcbb627dbda30d77b2eae
Refactor crypto.js and native client interface

NB: this diff is best viewed with --ignore-whitespace

Distills crypto.js down to the hard cryptoey bones. It pulls from
webcrypto for aes and hmac, and from native client for curve25519 stuff
or potentially another object implementing the handful of needed
curve25519 functions.

Everything else formerly known as crypto, including session storage and
management, axolotl, etc.. is now protocol.js. The separation is not
quite perfect, but it's a big step.

nativeclient.js now enables talking to the native client module through
a high level interface as well as registering callbacks that will be
executed once the module is loaded. And it has tests!

Finally, this commit removes all references to the "testing_only"
object, preferring to run tests on textsecure.crypto instead.