Add newman executable similar to rackup

[practicingruby]

I want to add a newman executable that takes a file similar to a rackup file and allows for something like

$ newman some_runner_file.rb --tick
$ newman some_runner_file.rb --loop --config path/to/config

Need to think through what the runner file syntax will look like, but it should be fairly minimal while exposing a server object (or similar) for manual configuration