Release v0.5 to PyPI

[baldwint]

Thanks for this great project! However, when I did pip install ipynb I got version 0.4, which does not correctly comment out markdown cells when converting into code (fixed in commit b266e352bf1726477129270d4530ed2df7bdc580, which lies between 0.4 and 0.5). Currently one must do pip install -e git+https://github.com/ipython/ipynb#egg=ipynb to get the fixed version.

NB, the PyPI page also has an old project URL http://github.com/yuvipanda/ipynb instead of http://github.com/ipython/ipynb .

[marbre]

:+1: I would appreciate an updated release at pypi as well to fetch the source from pypi for a gentoo ebuild.