Fix incorrect code line based on old libmadx API
Return strings from _str consistently
Add function libmadx.is_expanded
Add libmadx.__all__ (list of automatic exports)
Merge pull request #49 from coldfix/active-sequence

extend libmadx.py API to access sequence information
Merge pull request #46 from pymad/bootstrap-setup

Use setup_requires for numpy
Update CHANGELOG
Use custom replacement for table_get_column

As explained in the comment MAD-X r4777 fixes the handling of integer
columns in the table_get_column function. As it seems overkill to
require a new MAD-X version for a minor patch, the function is replaced
with a Cython snippet inside cpymad for now.

When we require a newer version of MAD-X sometime in the future, THIS
COMMIT MAY BE REVERTED.

There is one additional benefit to the replacement code though: The
ability to raise exceptions with more detailed descriptions on what went
wrong.
Add support for integer columns in tables

This requires either MAD-X revision 4777 or the code added in 00281a4.