Log Message:
Update to 2.12:

+ Version 2.12 (21.04.2015)

  - This is a fix release for 2.11; the memory optimization with __slots__ on
    Coord and AST nodes didn't take weakrefs into account, which broke cffi and
    its many dependents (iseue #76). Fixed by adding __weakref__ to __slots__.

+ Version 2.11 (21.04.2015)

  - Add support for C99 6.5.3.7 p7 - qualifiers within array dimensions in
    function declarations. Started with issue #21 (reported with initial patch
    by Robin Martinjak).
  - Issue #27: bug in handling of unified wstring literals.
  - Issue #28: fix coord reporting for 'for' loops.
  - Added ``examples/using_gcc_E_libc.py`` to demonstrate how ``gcc -E`` can
    be used instead of ``cpp`` for preprocessing.
  - Pull request #64: support keywords like const, volatile, restrict and static
    in dimensions in array declarations.
  - Reduce memory usage of AST nodes (issue #72).
  - Parsing order of nested pointer declarations fixed (issue #68).