Allow for excluding files/folders

[jaredmcateer]

I'm trying to run this task with the following config:

   grunt.initConfig({
     htmllint: {
       all: ["**/*.html", "!coverage/**/*.html"]
      }
    });

I want all the html files to be tested except those in the code coverage directory but when I tried the standard ! prefix this I get the following error:

Error: Command failed: /bin/sh: 1: Syntax error: "(" unexpected

[jzaefferer]

Seems like the exclusion pattern is passed through to the jar file, instead of getting replaced by grunt.file.expand.

@jawshooah could you take a look?

[jawshooah]

I can't reproduce with an identical config. @jaredmcateer, do any of your HTML files have a '(' somewhere in their paths, by chance?

[jawshooah]

Looks like the file paths aren't quoted before being passed to vnu.jar, so spaces or special characters in the path break everything. Submitting a PR that should fix it.