Save prekeys optimistically, track confirms, new clean behavior (#1846)

* Re-enable libtextsecure unit tests, get passing, run in CI

* Save prekeys optimistically, track confirmed, new clean behavior

* Eliminate potential conflicts when rotating on startup

* Remove last symlink: get libtextsecure tests running on windows

libtextsecure/test/_test.js

@@ -1,5 +1,6 @@
 mocha.setup("bdd");
 window.assert = chai.assert;
+window.PROTO_ROOT = '../../protos';
 
 (function() {
   var OriginalReporter = mocha._reporter;
@@ -52,3 +53,5 @@ function hexToArrayBuffer(str) {
     array[i] = parseInt(str.substr(i*2, 2), 16);
   return ret;
 };
+
+window.MockSocket.prototype.addEventListener = function() {};