simplify jQuery selector usage.

dream/platform/static/src/dream.js

@@ -26,7 +26,7 @@
       priv = {};
 
     priv.displayTool = function () {
-      var render_element = $("[id=tools-container]");
+      var render_element = $("#tools-container");
       for (var key in configuration) {
         if (key !== 'Dream-Configuration') {
           render_element.append('<div id="' + key + '" class="tool ' + key + '">' +

dream/platform/static/src/dream_launcher.js

@@ -215,7 +215,7 @@
       helper: "clone",
       stop: function (tool) {
         var box_top, box_left, _class;
-        var offset = $("[id=render]").offset();
+        var offset = $("#render").offset();
         box_top = (tool.clientY - offset.top)  / $('#main').height();
         box_left = (tool.clientX - offset.left)  / $('#main').width();
         id_container[tool.target.id] = (id_container[tool.target.id] || 0) +

dream/platform/static/src/jsonPlumb.js

@@ -298,7 +298,7 @@
     };
 
     that.clearAll = function () {
-      $("[id=render]").children().remove();
+      $("#render").children().remove();
       $.each(priv.node_container, function (element_id) {
         priv.removeElement(element_id);
       });
@@ -324,7 +324,7 @@
       var render_element, style_string = "",
         coordinate = element.coordinate,
         box;
-      render_element = $("[id=render]");
+      render_element = $("#render");
       if (coordinate !== undefined) {
         coordinate = priv.updateElementCoordinate(element.id, coordinate);
       }