add tail_slash option

Author: kstep

Diff for: config-example.json

@@ -1,3 +1,4 @@
 {
-    "base_index_url": ""
+    "base_index_url": "",
+    "tail_slash": false
 }

Diff for: index.html

@@ -169,7 +169,7 @@
 
         return $http({
             method: 'GET',
-            url: self.config.base_index_url + (path || '')
+            url: self.config.base_index_url + (path || '') + (self.config.tail_slash? '/': '')
         }).then(function (response) {
             var files = response.data || [];
 
@@ -210,7 +210,8 @@
             self.loading.stop();
 
             self.config = response.data || {
-                base_index_url: ""
+                base_index_url: "",
+                tail_slash: false
             };
 
             $scope.$on('$locationChangeSuccess', function () {