Allow glob in CLI mode

[Tiliavir]

The CLI should allow the usage of glob in my opinion - somthing like:

w3cjs validate "**/*.{htm,html}"

Currently I get

PS T:\> ./node_modules/.bin/w3cjs validate "**/*.html"
fs.js:584
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^

Error: ENOENT: no such file or directory, open 'T:\**\*.html'

System Info:

• w3cjs 0.3.0
• Windows 10 / PowerShell 5
• node.js 5.11.0 / npm 3.8.6