CLI args should not be caught by coffee if executing a script

CoffeeScript currently intercepts and handles command-line arguments which it can respond to, like -v and -h. It does this even if I execute a script file, i.e.
```bash
coffee myfile.coffee -v
CoffeeScript version 2.0.0-beta7
```
I would expect CoffeeScript to simply pass such arguments to the script being run. Currently, if my script is a command-line tool that is expected to show help messages on -h argument it will never execute.

I have managed to write a couple of test cases that demonstrate the problem, but I am not as skilled as to provide an actual patch.

Thanks for your help!