adds a main function in preperation of accepting args
adds argparse to parse cli args, still got issues with "couldn't connect to display"
this assignment is misleading, calling figure() _does_ have side effects
conditional import of matplotlib based on cli args, not sure this is the way...
removes old model_paths assignment
Merge branch 'master' into features/adds-option-parsing
thanks!
Merge pull request #331 from haarts/features/adds-option-parsing

Features/adds option parsing