Replaced hardcoded data home directory with MSMBuilder get_data_home() function.
Replaced hardcoded data home directory with MSMBuilder get_data_home() function.

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