[#427] Fixed styles in fields view.

src/widget.fields.js

@@ -25,12 +25,12 @@ this.recline.View = this.recline.View || {};
 my.Fields = Backbone.View.extend({
   className: 'recline-fields-view', 
   template: ' \
-    <div class="accordion fields-list well"> \
+    <div class="panel-group fields-list well"> \
     <h3>Fields <a href="#" class="js-show-hide">+</a></h3> \
     {{#fields}} \
-      <div class="accordion-group field"> \
-        <div class="accordion-heading"> \
-          <i class="icon-file"></i> \
+      <div class="panel panel-default field"> \
+        <div class="panel-heading"> \
+          <i class="glyphicon glyphicon-file"></i> \
           <h4> \
             {{label}} \
             <small> \
@@ -39,8 +39,8 @@ my.Fields = Backbone.View.extend({
             </small> \
           </h4> \
         </div> \
-        <div id="collapse{{id}}" class="accordion-body collapse"> \
-          <div class="accordion-inner"> \
+        <div id="collapse{{id}}" class="panel-collapse collapse"> \
+          <div class="panel-body"> \
             {{#facets}} \
             <div class="facet-summary" data-facet="{{id}}"> \
               <ul class="facet-items"> \