Use NumPy to locate LAPACK

[bfroehle]

We should ask NumPy what the preferred LAPACK is and use that to compile the extension module.

[dhermes]

>>> from numpy.distutils import system_info
>>> system_info.get_info('lapack')
{'language': 'f77', 'libraries': ['lapack'], 'library_dirs': ['/usr/lib']}

[dhermes]

In progress: https://codereview.appspot.com/102920044

[dhermes]

http://stackoverflow.com/questions/23252036 seems to indicate language is not needed in the Extension data.