Updated Python version to 2.6
Updated Python version to 2.6

Lnaden/pymbar,wesbarnett/pymbar,wesbarnett/pymbar,mrshirts/pymbar,jchodera/pymbar,jchodera/pymbar,mrshirts/pymbar,choderalab/pymbar,jchodera/pymbar,Lnaden/pymbar,kyleabeauchamp/pymbar,mrshirts/pymbar,Lnaden/pymbar,jchodera/pymbar,kyleabeauchamp/pymbar,mrshirts/pymbar,kyleabeauchamp/pymbar,choderalab/pymbar,choderalab/pymbar,kyleabeauchamp/pymbar,wesbarnett/pymbar,wesbarnett/pymbar