add more files to .gitignore
refactor run_comparison
disable ipython-physics bench, it no longer works with latest uncertainties package (2.4.4)
update pint info
allow exporting data as pandas DataFrame objects
Merge remote-tracking branch 'toddrjen/ipython'

* toddrjen/ipython:
  allow exporting data as pandas DataFrame objects
  update pint info
  disable ipython-physics bench, it no longer works with latest uncertainties package (2.4.4)
  refactor run_comparison
  add more files to .gitignore
Added IPython notebook to display tables
Added script to download ScientificPython