Support -- full stop CLI args

[mattdesl]

As more flags are added to devtool CLI, they will start to pollute the flags that a program may want to use for whatever reason.

Maybe when a full stop is present, --, anything after that will be present in the process.argv for the running program, and the other flags (e.g. --browser-field) will be stripped.

devtool app.js --browser-field -- -q -b --blah

[halhenke]

Sounds good - is consistent with the way other tools solve this problem 👍

EDIT: I guess this is related (maybe also for #10 and #11) but I quickly commented out the lines adding .js extension to the file argument and I got this error messsage:
Unknown Flag: -harmony_arrow_functions. Run fly -h to see the options.
which seems to show node flags being passed to the program instead. Not sure if that should be a new issue or dealt with here?

[mattdesl]

This is now supported in 1.2.1, it also cleans up gulp/grunt debugging. 🍻

[halhenke]

Awesome!