Changed files vasp_ouput.py and test_vasp_ouput.py to include parsing of the ionic part of the dielectric constant. Also added in pymatgen/test_files/ the file vasprun.xml.dfpt.ionic that includes the ionic part of the dielectic constant for testing purposes
Merge pull request #167 from petousis/master

Include parsing of the ionic part of the static dielectric constant
Automatic Py3k merge for testing