Remove extra '/' in RemoteSpec

urljoin appends a '/' if only the domain is in the url path.  This
change strips that off before creating a RemoteSpec
diff --git a/manifest_xml.py b/manifest_xml.py
index 02a5f9a..9189eec 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -59,7 +59,7 @@
     return re.sub(r'^gopher://', '', url)
 
   def ToRemoteSpec(self, projectName):
-    url = self.resolvedFetchUrl + '/' + projectName
+    url = self.resolvedFetchUrl.rstrip('/') + '/' + projectName
     return RemoteSpec(self.name, url, self.reviewUrl)
 
 class XmlManifest(object):