Add support to release to a separate component repo

Would like to see the wycats/handlebars -> components/handlebars + walmartlabs/thorax -> components/thorax use cases covered.

Might be useful to look at https://github.com/walmartlabs/grunt-release-component but this repo already looks much cleaner and better thought out. Will likely delete `grunt-release-component` once this issue is closed.