Fix for doctest in computeOverlap
Fix for doctest in computeOverlap

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