Add documentation of all the command line options

[mjtamlyn]

No description provided.

[audreyfeldroy]

Is there a way to compare two benchmarks from the same branch against each other? For example, comparing the rendering of 2 views, both from Django 1.8.

If so, I'd be very interested in docs on that option in particular. (and @pydanny and I might be able to contribute some of our benchmark experiments from last night)

I tried to figure it out for myself by looking in main.py, but I couldn't figure this one out, sorry.

[mjtamlyn]

You'd want to write a benchmark using run_comparison_benchmark and run it independently I think https://github.com/django/djangobench/blob/master/djangobench/utils.py#L86