add ui integration to Vagrantifile and docs

Vagrantfile

@@ -22,4 +22,5 @@ Vagrant::Config.run do |config|
   # Try to use NFS only on platforms other than Windows
   nfs = !Kernel.is_windows?
   config.vm.share_folder("treeherder", "/home/vagrant/treeherder-service", "./", :nfs => nfs)
+  #config.vm.share_folder("treeherder-ui", "/home/vagrant/treeherder-ui", "../treeherder-ui/", :nfs => nfs)
 end

docs/index.rst

@@ -14,6 +14,7 @@ Contents:
    installation
    dataload
    deployment
+   ui_integration
 
 
 Indices and tables

docs/ui_integration.rst

@@ -0,0 +1,17 @@
+Integrating the ui
+==================
+
+If you want to develop both the ui and the service side by side it may be convenient to load the ui in the vagrant environment.
+To do so, uncomment this line in the Vagrantfile
+
+  .. code-block:: ruby
+     
+     #config.vm.share_folder("treeherder-ui", "/home/vagrant/treeherder-ui", "../treeherder-ui/", :nfs => nfs)
+
+Make sure treeherder-ui is cloned in the same folder as treeherder-service (same parent folder) and reload you vagrant environment with
+
+  .. code-block:: bash
+     
+     >vagrant reload
+
+You should now be able to access the ui on http://local.treeherder.mozilla.org/ui/