Allow interpreter hashbang on first line of document

[guillaumekh]

It is possible to write nodeJS scripts that are executable straight from shell.

To do so, one has to :

• make the script executable (i.e. chmod +x)
• add a "hashbang" at the beginning of the script to tell the shell which interpreter the script should be passed on to (e.g. #! /usr/local/bin/node)

Currently, standard issues the following warning for the hashbang :

Expected space or tab after "//" in comment.

The new behavior would throw no such warning.

Tested with linter-js-standard

[guillaumekh]

I filled that issue too fast. It seems actually standard throws no warning. Sorry for the spam 😕