prepare release of 0.17.2

CHANGES.rst

@@ -2,7 +2,7 @@
 Cython Changelog
 ================
 
-0.17.2 (2012-11-??)
+0.17.2 (2012-11-20)
 ===================
 
 Features added
@@ -13,6 +13,8 @@
 Bugs fixed
 ----------
 
+* Replacing an object reference with the value of one of its cdef attributes could generate incorrect C code that accessed the object after deleting its last reference.
+
 * C-to-Python type coercions during cascaded comparisons could generate invalid C code, specifically when using the 'in' operator.
 
 * "obj[1,]" passed a single integer into the item getter instead of a tuple.

Cython/__init__.py

-__version__ = "0.17.2rc1"
+__version__ = "0.17.2"
 
 # Void cython.* directives (for case insensitive operating systems).
 from Cython.Shadow import *