Lerna support

[nahtahul]

Add support for automatically handling the tagging/release creation process for Lerna monorepos. This will involve hoisting out the path to the VERSION file and prepending a owner name to tags in the form @owner/package@version. This will also require being able to push multiple tags at once and a CHANGELOG.md in each successive package.

See https://github.com/lightspeed/flame/blob/next/packages/flame/package.json#L2