Added readme specifying environment variable needed to point to OOMMF
Added readme specifying environment variable needed to point to OOMMF

fangohr/oommf-python,fangohr/oommf-python,ryanpepper/oommf-python,ryanpepper/oommf-python,fangohr/oommf-python,ryanpepper/oommf-python,ryanpepper/oommf-python