Send path when renaming pages.

Fix nil error on editing a non-existent page.
Use baseURL on delete.

lib/gollum/frontend/app.rb

@@ -143,7 +143,7 @@ module Precious
 
       page = wiki.page(rename) if rename
 
-      redirect to("/#{page.escaped_url_path}")
+      redirect to("/#{page.escaped_url_path}") unless page.nil?
     end
 
     get '/delete/*' do

lib/gollum/frontend/public/gollum/javascript/gollum.js

@@ -4,7 +4,7 @@ $(document).ready(function() {
     var ok = confirm($(this).data('confirm'));
     if ( ok ) {
       var loc = window.location;
-      loc = loc.protocol + '//' + loc.host + '/delete' + loc.pathname
+      loc = baseUrl + 'delete' + loc.pathname
       window.location = loc;
     }
     // Don't navigate on cancel.
@@ -113,8 +113,11 @@ $(document).ready(function() {
     $('#minibutton-rename-page').click(function(e) {
       e.preventDefault();
 
-      var path = window.location.pathname;
-      var oldName = path.substring(path.lastIndexOf('/')+1);
+      // Path name without the leading slash.
+      var pathname = window.location.pathname.substr(1);
+      var slashIndex = pathname.lastIndexOf('/');
+      var oldName = pathname.substr(slashIndex + 1)
+      var path = pathname.substr(0, slashIndex);
 
       $.GollumDialog.init({
         title: 'Rename Page',
@@ -127,19 +130,19 @@ $(document).ready(function() {
           }
         ],
         OK: function( res ) {
-          var name = 'Rename Page';
+          var newName = 'Rename Page';
           if ( res['name'] ) {
-            name = res['name'];
+            newName = res['name'];
           }
 
-          var msg = 'Renamed ' + oldName + ' to ' + name;
+          var msg = 'Renamed ' + oldName + ' to ' + newName;
           jQuery.ajax( {
             type: 'POST',
-            url: baseUrl + '/edit/' + oldName,
+            url: baseUrl + 'edit/' + oldName,
             // omit path: pathName until https://github.com/github/gollum/issues/446 is fixed.
-            data:  { rename: name, page: oldName, message: msg },
+            data:  { path: path, rename: newName, page: oldName, message: msg },
             success: function() {
-                window.location = baseUrl + '/' + encodeURIComponent(name);
+                window.location = baseUrl + encodeURIComponent(newName);
             }
           });
         }
@@ -172,7 +175,7 @@ $(document).ready(function() {
           if ( res['name'] ) {
             name = res['name'];
           }
-          window.location = baseUrl + '/' + encodeURIComponent(name);
+          window.location = baseUrl + encodeURIComponent(name);
         }
       });
     });