Just discovered an undocumented API in bower-resolve that allows you to resolve ids synchronously
Merge branches 'master' and 'master' of https://github.com/sogko/externalise-bower

* 'master' of https://github.com/sogko/externalise-bower:
  Update README.md

* 'master' of https://github.com/sogko/externalise-bower:
  Update README.md