bug(back button): back button now is disabled when invalid

mod/dashboard/app/scripts/controllers/browser.js

@@ -44,7 +44,7 @@ angular.module('etcdBrowser', ['ngRoute', 'etcd', 'timeRelative'])
     localStorage.setItem('etcdPath', $scope.etcdPath);
     $scope.enableBack = true;
     //disable back button if at root (/v1/keys/)
-    if($scope.etcdPath === '') {
+    if($scope.etcdPath === '/v1/keys') {
       $scope.enableBack = false;
     }
 

mod/dashboard/app/views/browser.html

@@ -23,7 +23,7 @@
         </div>
     </div>
     <div class="etcd-header solid">
-        <a class="etcd-back" ng-click="back()" ng-class="{false:'etcd-disabled'}[enable_back]">
+        <a class="etcd-back" ng-click="back()" ng-class="{false:'etcd-disabled'}[enableBack]">
             <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
             preserveAspectRatio="xMinYMin" viewBox="0 0 73.356 61" enable-background="new 0 0 73.356 61" xml:space="preserve">
             <path d="M5.27,33.226l22.428,22.428c1.562,1.562,4.095,1.562,5.657,0c1.562-1.562,1.562-4.095,0-5.657L17.77,34.413h48.514