Update libaxolotl, handle untrusted identitykey

Previously we had no access to the new untrusted identity
for verification purposes.

// FREEBIE

libtextsecure/axolotl_wrapper.js

@@ -21,7 +21,7 @@
                     if (e.message === 'Unknown identity key') {
                         // create an error that the UI will pick up and ask the
                         // user if they want to re-negotiate
-                        throw new textsecure.IncomingIdentityKeyError(fromAddress, blob);
+                        throw new textsecure.IncomingIdentityKeyError(fromAddress, blob, e.identityKey);
                     }
                     throw e;
                 });