Changes 2.5.5:
* built documentation is no longer part of release.

Changes 2.5.4:
* Fixed extensions not loading properly with overlays.
* Work around a bug in cpython for the debugger that causes segfaults
  on 64bit big-endian architectures.

Changes 2.5.3:
* fixed an operator precedence error introduced in 2.5.2.  Statements
  like "-foo.bar" had their implicit parentheses applied around the
  first part of the expression ("(-foo).bar") instead of the more
  correct "-(foo.bar)".

Changes 2.5.2:
* improved setup.py script to better work with assumptions people
  might still have from it (``--with-speedups``).
* fixed a packaging error that excluded the new debug support.

(adam)