Add new option `expand`

[artch]

An option for organizing the file structure by package rather than placing them all in one directory. Useful when some filenames could intersect with each other.

bower: {
  dev: {
    dest: 'public/vendor/',
    options: {
      expand: true
    }
  }
}

/public
  /vendor
    /package1
      package1_file1.js
      package1_file2.js
      package1.css
    /package2
      package2.js
      package2.css

Or organized by file type in addition:

bower: {
  dev: {
    dest: 'public/',
    js_dest: 'public/js/'
    css_dest: 'public/css/',
    options: {
      expand: true
    }
  }
}

/public
  /js
    /package1
      package1_file1.js
      package1_file2.js
    /package2
      package2.js
  /css
    /package1
      package1.css
    /package2
      package2.css

[curist]

This is indeed a pretty good feature to have. My only complain is the name expand may cause some confusion. groupByPackage or similar may be more suitable.

[artch]

Well, it is widely used in the same context in grunt-copy for example.

Another options: expandByName, expandByPackage, sortByName, organize. Or we can come with another approach: an option flatten which is true by default, and setting it to false will work in the same manner.

[curist]

Alright, though I think expandByPackage is a little better, expand slowly making more sense to me.