run pack with just an element map

[edeustace]

Allow pack to run with just an element map definition. This will allow pack to run for n number of items.

//my-elements.js
module.exports = {
  'el-one': '@foo/bar@1.0.0'
}

pie pack --elements ./my-elements.js

• How to handle element naming - say 2 element names pointing at the same dependency?