Bump version to 2.7.5rc1.
Ignore unknown fields when parsing SSL certs.

Who knows what might actually exist in certificates in the wild? Best
to just ignore unknown fields than error on them. In particular, the
pypi.python.org certificate breaks, which is *kind of important*.
Disable py_compile.compile.

This is used by pip and caused pip errors.
Change exception string to match Python 2.7.
Use __future__.py from CPython.

This version vas features like compiler flags that other libraries use.