ASTERIA is Missing Command-line functionality of USSR

[sgriswol]

(Request from Lutz) In USSR, it was possible to easily iterate through a wide variety of simulation configurations and to take commands from terminal. ASTERIA lacks this functionality

• Implement command line functionality for ASTERIA
  Potential new Features:

1. New fields in configuration YAML (OR new top-level config simulation YAML) which describes ALL options of simulation..
2. New methods (in IO.py) to parse command-line options
3. New Methods (in IO.py) to parse an iterable of options within yaml file or at command line
4. New Methods/objects to run the full simulation (Potentially set up methods to individually handle steps outlined in detector_response.ipynb)

[sybenzvi]

This has been implemented in the scripts branch and merged with master.