Update for recent whale-island changes

[cgewecke]

• [x] Update function signatures: authTx is verifyPresence, authAndSend is verifyPresenceAndSend, getVerifiedTx is getClientTx
• [x] Write getPgpKeyId & bind key to core.peripheral object.
• [x] Fetch key from MIT,
• [x] Encrypt verifyPresence, verifyPresenceAndSendTx endpoints after getting/signing pin.
• [x] Write getContractAddress
• [x] Write sendTx
• [x] Remove sessionId logic
• [x] Refactor bluetoothAuto ( this has its own issue now at #39)
• [x] Add a 'readAndConfirm' method for messagePublicationRequests.
• [x] Add 'detect arbitrary beacon' method for beaconBroadcasts (this has its own issue now at #40)