Workaround to fix promises in IE11.

Polymer polyfill has an incomplete implementation of Promises
webcomponents/webcomponentsjs#800

vaadin-pouchdb.html

@@ -1,5 +1,21 @@
-
+<script>
+  if (Promise && !Promise.all) {
+    // In IE11 we force couchdb to load its own implementation of promises
+    // since webcomponents-lite polyfill lacks the `.all` method.
+    // See: https://github.com/webcomponents/webcomponentsjs/issues/800
+    window.__Promise = Promise;
+    Promise = undefined;
+  }
+</script>
 <script src="../pouchdb/dist/pouchdb.js"></script>
+<script>
+  if (window.__Promise) {
+    // We need to restore back old implementation of Promises.
+    // Pouchdb uses it's own internal PouchPromise reference.
+    Promise = window.__Promise;
+    window.__Promise = undefined;
+  }
+</script>
 
 <link rel="import" href="../polymer/polymer.html">
 
@@ -60,7 +76,7 @@
       },
       queryString: {
         type: String,
-        value: ""
+        value: ''
       }
     },
 
@@ -106,7 +122,7 @@
       this.close();
       this.data = [];
       if (this.dbname) {
-        console.log("PouchDB local connection to: " + this.dbname);
+        console.log('Vaadin-PouchDB connected locally to: ' + this.dbname);
         this._db = new PouchDB(this.dbname);
         this.async(function() {
           this.fire('pouchdb-connect', this.dbname);
@@ -225,7 +241,7 @@
      * @param {Function} func
      */
     changes: function(func, conf) {
-      console.log("PouchDB listening to changes in: " + this.dbname);
+      console.log('Vaadin-PouchDB listening to changes in: ' + this.dbname);
       this._changesHandler = this._db.changes(conf || {
         since: 'now',
         live: true,
@@ -284,7 +300,7 @@
       query = this.queryString || query || this._indexes && this._indexes[0];
 
       return this._debounce('query', () => {
-        console.log("Running Query");
+        console.log('Vaadin-PouchDB running the Query ' + (query ? query : 'allDocs'));
         return (query ? this._db.query(query, conf) : this._db.allDocs(conf))
           .then(function(req) {
             if (req.rows) {
@@ -294,7 +310,7 @@
             } else {
               this.data = []
             }
-            console.log('Query returned: ' + this.data.length + ' rows');
+            console.log('Vaadin-PouchDB query returned ' + this.data.length + ' rows.');
           }.bind(this))
           .then(this._statusdone.bind(this));
       }, 250);
@@ -303,7 +319,7 @@
     createIndex: function(prop) {
       var views = {};
       views[prop] = {
-        map: "function(doc){if(doc." + prop + ") emit(doc." + prop + ")}"
+        map: 'function(doc){if(doc.' + prop + ') emit(doc.' + prop + ')}'
       }
       var idx = {
         _id: '_design/' + prop,
@@ -324,15 +340,15 @@
      * @param {Function} err
      */
     sync: function(fnc, err, conf) {
-      console.log("PouchDB syncing local: " + this.dbname + " to: " + this.remote);
+      console.log('Vaadin-PouchDB syncing local: ' + this.dbname + ' to: ' + this.remote);
       if (!this._db || !this.remote || this._synchandler) return this._synchandler;
       var opts = conf || {
         timeout: 0
       };
       if (this.liveSync) {
         opts.live = opts.retry = true;
       }
-      console.log("PouchDB syncing local: " + this.dbname + " to: " + this.remote + " " + opts);
+      console.log('Vaadin-PouchDB syncing local: ' + this.dbname + ' to: ' + this.remote + ' ' + opts);
       // TODO: normally the sync is in paused status, seems that active is
       // only for the very short time some data is being transferred.
       var h = this._db.sync(this.remote, opts);