- Update to version 0.20:
  * Support for CPython 3.4.
  * Support for calling C++ template functions.
  * yield is supported in finally clauses.
  * The C code generated for finally blocks is duplicated for each exit
    case to allow for better optimisations by the C compiler.
  * Cython tries to undo the Python optimisationism of assigning a bound
    method to a local variable when it can generate better code for the
    direct call.
  * Constant Python float values are cached.
  * String equality comparisons can use faster type specific code in
    more cases than before.
  * String/Unicode formatting using the '%' operator uses a faster
    C-API call.
  * bytearray has become a known type and supports coercion from and
    to C strings.  Indexing, slicing and decoding is optimised. Note that
    this may have an impact on existing code due to type inference.
  * Using cdef basestring stringvar and function arguments typed as
    basestring is now meaningful and allows assigning exactly
    str and unicode objects, but no subtypes of these types.
  * Support for the __debug__ builtin.
  * Assertions in Cython compiled modules are disabled if the running
    Python interpreter was started with the "-O" option.
  * Some types that Cython provides internally, such as functions and
    generators, are now shared across modules if more than one Cython
    implemented module is imported.
  * The type inference algorithm works more fine granular by taking the
    results of the control flow analysis into account.
  * A new script in bin/cythonize provides a command line frontend
    to the cythonize() compilation function (including distutils build).

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