Log Message:
Update to 0.20.1:

===================
0.20.1 (2014-02-11)
===================

Bugs fixed
----------

* List/Tuple literals multiplied by more than one factor were only multiplied
  by the last factor instead of all.

* Lookups of special methods (specifically for context managers) could fail
  in Python <= 2.6/3.1.

* Local variables were erroneously appended to the signature introspection
  of Cython implemented functions with keyword-only arguments under Python 3.

* In-place assignments to variables with inferred Python builtin/extension
  types could fail with type errors if the result value type was incompatible
  with the type of the previous value.

* The C code generation order of cdef classes, closures, helper code,
  etc. was not deterministic, thus leading to high code churn.

* Type inference could fail to deduce C enum types.

* Type inference could deduce unsafe or inefficient types from integer
  assignments within a mix of inferred Python variables and integer
  variables.