Add -l flag to allow 'module load XXX' to work

If I try to run a qsub job on geo.bu.edu and it requires modules
I've loaded in my .bashrc (e.g., 'module load hdf5' in this case),
the job only works if my script has a '-l' flag after the shebang.

Apparently some users don't have this issue, but it doesn't seem like
the flag hurts anything even when its not needed.