Update README examples

[odoe]

I broke out each example separately for new features. Think it's overkill?

Thanks!

[odoe]

Maybe that's a little wordy, how about something like this:

  files: [ 'main.js' ],                                           // string pattern
  // files: [ '*.js' ],                                           // glob pattern
  // files: [ new RegExp('main' + '(.*js)') ],                    // regular expression
  // files: [ function(x) { return x.indexOf('main') > -1; }  ],  // function

[Turbo87]

@odoe I like that second suggestion

@rwjblue any opinions on this?