Debugging Grunt/Gulp/etc

[mattdesl]

I haven't done much testing with Gulp/Grunt inside devtool, first is to figure out how the commands should look (i.e. handling process.argv nicely) and then any additional problems that might crop up, e.g. native addons.

Also see #10.

[mattdesl]

Ok, just gave gulp and gulp-sass a quick run and things seem to be working nicely with devtool@1.2.1.

The -- option should be used to clear devtool options and ensure they don't conflict with gulp.

# same as running "gulp"
devtool node_modules/gulp/bin/gulp.js -c --

# same as running "gulp watch"
devtool node_modules/gulp/bin/gulp.js -c -- wach

Here a breakpoint is hit after changing a local SASS file with gulp watch.

Will add to readme eventually.