Fix demo site custom template error. Close #338

custom-template.html

-<span class="rz-bar-wrapper"><span class="rz-bar"></span></span> <!-- // 0 The slider bar -->
-<span class="rz-bar-wrapper">
+<div class="rzslider">
+  <span class="rz-bar-wrapper"><span class="rz-bar"></span></span> <!-- // 0 The slider bar -->
+  <span class="rz-bar-wrapper">
     <span class="rz-bar rz-selection" ng-style="barStyle"></span>
-</span> <!-- // 1 Highlight between two handles -->
-<span class="rz-pointer rz-pointer-min" ng-style=minPointerStyle></span> <!-- // 2 Left slider handle -->
-<span class="rz-pointer rz-pointer-max" ng-style=maxPointerStyle></span> <!-- // 3 Right slider handle -->
-<span class="rz-bubble rz-limit"></span> <!-- // 4 Floor label -->
-<span class="rz-bubble rz-limit"></span> <!-- // 5 Ceiling label -->
-<span class="rz-bubble"></span> <!-- // 6 Label above left slider handle -->
-<span class="rz-bubble"></span> <!-- // 7 Label above right slider handle -->
-<span class="rz-bubble"></span> <!-- // 8 Range label when the slider handles are close ex. 15 - 17 -->
-<ul ng-show="showTicks" class="rz-ticks"> <!-- // 9 The ticks -->
+  </span> <!-- // 1 Highlight between two handles -->
+  <span class="rz-pointer rz-pointer-min" ng-style=minPointerStyle></span> <!-- // 2 Left slider handle -->
+  <span class="rz-pointer rz-pointer-max" ng-style=maxPointerStyle></span> <!-- // 3 Right slider handle -->
+  <span class="rz-bubble rz-limit"></span> <!-- // 4 Floor label -->
+  <span class="rz-bubble rz-limit"></span> <!-- // 5 Ceiling label -->
+  <span class="rz-bubble"></span> <!-- // 6 Label above left slider handle -->
+  <span class="rz-bubble"></span> <!-- // 7 Label above right slider handle -->
+  <span class="rz-bubble"></span> <!-- // 8 Range label when the slider handles are close ex. 15 - 17 -->
+  <ul ng-show="showTicks" class="rz-ticks"> <!-- // 9 The ticks -->
     <li ng-repeat="t in ticks track by $index" class="rz-tick"
         ng-class="{'rz-selected': t.selected}" ng-style="t.style"
         ng-attr-uib-tooltip="{{ t.tooltip }}" ng-attr-tooltip-placement="{{t.tooltipPlacement}}"
@@ -18,4 +19,5 @@
           ng-attr-uib-tooltip="{{ t.valueTooltip }}"
           ng-attr-tooltip-placement="{{t.valueTooltipPlacement}}" ng-bind-html="t.value"></span>
     </li>
-</ul>
+  </ul>
+</div>