Moved the cifarSC2011/extending_theano.txt to the tutorial.

NEWS.txt

 .. _NEWS:
 
+Update in the Trunk since the last release:
+
+* Added in the tutorial documentation on how to extend Theano.
+  This explain how to make a Theano Op from a python function.
+  http://deeplearning.net/software/theano/tutorial/extending_theano.html
+
+
 =============
 Release Notes
 =============

doc/cifarSC2011/index.txt

@@ -65,7 +65,7 @@ from gurus on hand if you get stuck.
     introduction
     theano
     advanced_theano
-    extending_theano
+    /tutorial/extending_theano
     pyCUDA
     gpundarray
 

doc/tutorial/index.txt

@@ -38,5 +38,6 @@ you out.
     gpu_data_convert
     shape_info
     remarks
+    extending_theano
     debug_faq
     faq