moved caching from loaders to environment and added environment overlays

--HG--
branch : trunk
diff --git a/docs/jinjaext.py b/docs/jinjaext.py
index 8485a62..57c7097 100644
--- a/docs/jinjaext.py
+++ b/docs/jinjaext.py
@@ -43,7 +43,7 @@
         Name.Tag:                   'bold #686868',
         Name.Decorator:             '#686868',
 
-        String:                     '#BE9B5D',
+        String:                     '#AA891C',
         Number:                     '#444444',
 
         Generic.Heading:            'bold #000080',