Removed the example in the index of docs

It wasn't very useful and was always out of date.
Forgot PR link for removing the io module
Updated install instructions to recommend Anaconda

This simplifies things. Will deprecate the windows installer and make
everything pip-installable.
Updated year in license text
Packaging renames README and CITATION to txt

rst is not a very pleasant extension for Windows users but Github loves
it. So rename before packaging.
Merge pull request #83 from leouieda/docs-install

Update install instructions