Add setting option to refresh metadata

Author: AasthaGupta

code/js/metadata.js

@@ -50,6 +50,6 @@ function populate () {
 	});	
 }
 
-if (!localStorage["metadata"]) {
+if (!localStorage["metadata"] || location.hash === "#refresh") {
 	populate();
 }

code/popup.html

@@ -53,8 +53,13 @@
 
                   <a class="btn float-right" target="_blank" id="favButton" href="javascript:void(0)">Favorites</a>
 
+                  <button class="btn dropdown-toggle dropdown_button float-right" type="button" data-toggle="dropdown">Settings<span class="caret"></span></button>
+                        <ul class="dropdown-menu" id="main_drop_menu">
+                            <li class="dropdown_button" title="Refresh data">
+                                <a href="?#refresh">Refresh</a>
+                            </li>
+                         </ul>
 
-                  
                   <div class="dropdown">
                     <button class="btn dropdown-toggle dropdown_button float-right" type="button" data-toggle="dropdown">More Apps<span class="caret"></span></button>
                         <ul class="dropdown-menu" id="main_drop_menu">