fixed a few broken license declarations. should have been BSD not GPL

--HG--
branch : trunk
diff --git a/jinja2/optimizer.py b/jinja2/optimizer.py
index 4838971..43065df 100644
--- a/jinja2/optimizer.py
+++ b/jinja2/optimizer.py
@@ -14,7 +14,7 @@
     The solution would be a second syntax tree that has the scoping rules stored.
 
     :copyright: Copyright 2008 by Christoph Hack, Armin Ronacher.
-    :license: GNU GPL.
+    :license: BSD.
 """
 from jinja2 import nodes
 from jinja2.visitor import NodeTransformer