v1.3.0

Remove 1000 messageKey limit entirely, along with custom limits (signalapp#42)
Throw error if asked to jump forward in chain by over 2000 (signalapp#43)

Remove logging from verifyMAC on mismatch (signalapp#44)

Update to new signalapp github organization (signalapp#45)
Fix code example typo in Readme (signalapp#39)

v1.2.0

Quite a few changes to reflect new behavior around identity keys rolled
out in the Signal apps in June 2017:
  - We always trust a new identity key when receiving messages
  - We have a few requirements for trust when sending messages:
    1) it can't have changed very recently
    2) if the previous identity key had been verified by the user, the
       user needs to explicitly approve a new identity key

Expose ability to delete all existing sessions - for proper reset (signalapp#35)

Allow caller to provide fillMessageKeys limit - allowing customization
  of the maxiumum number of one-sided messages in a conversation (signalapp#29)

Dev:
  - A number of changes to make the branch build in CI, add badge, etc.

Note: we appear to have some unreliability during our Firefox 34 builds
on Sauce. A little less than half the time the test fails with an out of
memory error.

Promote old session states

Fix test for presence of registrationId

Fix crashes when no preKey is present

Adds a test identical to the 'basic prekey v3' test with the addition of
`delete preKeyBundle.preKey` where appropriate.

Open sessions must have registrationIds

Add support for migrating old SessionRecords

Attempt to upgrade old SessionRecords based on their version.
You only need this if you must support existing data.

Add support for numeric fingerprints

Include remote registrationId in encryption result

The signal service requires this field to accompany outgoing ciphertexts.
With this change we can likely remove the correspinding getter from
SessionCipher.

Decrypt against previous sessions

In congruence with the java implementation, attempt to decrypt against
previous session states if decryption fails using the open session.