Name of sdist depends on whether we build a wheel

[Carreau]

$ python setup.py bdist_wheel sdist &>/dev/null ; shasum -a 256 dist/*
82eec3c9638bb1b125e23eb13522a5b193f72008f3baa19f3557d1d005bfb38d  dist/ipython-6.2.0.dev0-py3-none-any.whl
d0deb08a1d7236060e91d00e65185869497995ad27d7e3dccf7a8d259a9d9339  dist/ipython-6.2.0.dev0.tar.gz
$ rm -rf dist/*
$ python setup.py sdist &>/dev/null ; shasum -a 256 dist/*
9e2383c21a6c5f800c5f30aadd107cf7f13561bdadae833adef46a7cd5b69175  dist/ipython-6.2.0.dev.tar.gz

In particular building bdist_wheel add a 0 after .dev

[minrk]

this doesn't really matter for dev versions, but it is fixable if we follow the conventions adopted by most of our other packages at this point, which is to pull in setuptools unconditionally in setup.py and just blacklist the implicit egg-install.