Merge pull request #82 from coldfix/numpy-independent-build

Remove build-time dependency on numpy
svn checkout url changed from svnweb to svn now
Merge pull request #87 from Eothred/new_madx_svnurl

svn checkout url changed
Bootstrap dependency on setuptools in setup.py

Including and using ez_setup.py is the officially recommended way to
make sure setuptools is available (though not necessarily installed)
during installation. See:

https://pypi.python.org/pypi/setuptools/5.7#installation-instructions
Rely on setuptools to set up the namespace package

setuptools is a dependency anyway, so it's fine to fail in case it's not
available.
Include ez_setup.py in source distribution
Fix problem with pip and ez_setup.py