Allow --importRoot to override root config option

[simonsmith]

This depends on the fix in #69 before the tests will pass. We could probably add a test for @casio's work in the same describe.

cc @giuseppeg

[giuseppeg]

You could keep the original version and add an aliases map like so:

var optsAliases = {
  importRoot: 'root'
}

var flags = [
  'minify',
  'encapsulate',
  'root',
  'importRoot',
  'lint'
].reduce(function (accumulator, inFlag) {
  if (({}).hasOwnProperty.call(program, inFlag)) {
    var flag = optsAliases[inFlag] || flag
    accumulator[flag] = program[inFlag];
  }
  return accumulator;
}, {});

[simonsmith]

I think that's a much cleaner solution. Will refactor after the other PR goes in

[simonsmith]

Updated