Pass all remaining args to the script for "dub [file].d" invocations.

[s-ludwig]

Fixes #856.

[s-ludwig]

@Geod24: Do you agree with this, or do you still have doubts or maybe an alternative?

[coveralls]

Coverage decreased (-0.01%) to 60.335% when pulling 90299db on issue856-shebang-args into 6cc5055 on master.

[Geod24]

However, this syntax is already there primarily to support shebang scripts, and AFAIK this is the only portable way to be able to pass parameters to the application.

I think that's a compelling argument, so the idea LGTM.
Could this be documented anywhere though ?

[s-ludwig]

Yes, this definitely needs to be documented. I'll put a section at http://code.dlang.org/getting_started for now.