DOC: Updated long_description in setup.py.

 * Updated citation information (including conversion of
   LONG_DESCRIPTION to unicode so we can spell Lopez Rios correctly).

 * Updated installation instructions.
REL: Release 1.0.

This is the first public release of 'contactpp'. It includes:

 * Construction of Troullier-Martins, UTP and square well
   pseudopotentials for all branches of the contact interaction.
 * Scripts to export the pseudopotential for inclusion in the Casino
   input file.