BUG: run_experiment is broken

[JamesOwers]

but weirdly, my run_experiment script is broken

getopts appears to have changed behaviour

all examples where you want to supply slurm args are wrong, you now need to insert a -- between normal and slurm args to avoid error

e.g.
BAD

run_experiment -b example/slurm_arrayjob.sh -e example/experiments.txt \\
  -m 12 --cpus-per-task=4 --gres=gpu:1 --mem=8000

GOOD

run_experiment -b example/slurm_arrayjob.sh -e example/experiments.txt \\
  -m 12 -- --cpus-per-task=4 --gres=gpu:1 --mem=8000

Update all usage examples