@thejameskyle asked me to compile this list of things we'd need to expose for a public API, for https://github.com/atlassian/lerna-semantic-release

• We need a way to know what all of the packages are (currently using PackageUtilities.getPackages). We need to be able to get the package.json data from the packages.

Other than that, lerna is mostly used through the CLI – you lerna run most of the semantic release steps. The only other things necessary have been added in PR's, such as #163