Add icons on buttons

dream/platform/static/index.html

@@ -27,15 +27,15 @@
       <div id="tools">
         <h4>Tools</h4>
         <div id="tools-container"></div>
-        <a id="clear_all">Clear All</a>
-        <a id="layout_graph">Layout Graph</a>
-        <a id="zoom_in">Zoom +</a>
-        <a id="zoom_out">Zoom -</a>
-        <a id="export">Export</a>
+        <a id="clear_all"> <i class="fa fa-magic"></i> Clear All</a>
+        <a id="layout_graph"><i class="fa fa-sitemap"></i> Layout Graph</a>
+        <a id="zoom_in"><i class="fa fa-plus"></i> Zoom +</a>
+        <a id="zoom_out"><i class="fa fa-minus"></i> Zoom -</a>
+        <a id="export"><i class="fa fa-cloud-download"></i> Export</a>
         <form id="export_form" style="display:none" method="post" action="../postJSONData">
           <textarea id="export_json" name="data"></textarea>
         </form>
-        <a id="import">Import</a>
+        <a id="import"><i class="fa fa-cloud-upload"></i> Import</a>
         <form id="import_form" style="display:none">
           <input id="import_file" name="file" type="file"></input>
         </form>