Add "release" bin script

Which should read last commit message and if it contains "TAG:" should publish under that tag
- https://github.com/bahmutov/simple-commit-message/issues/1
- https://medium.com/greenkeeper-blog/one-simple-trick-for-javascript-package-maintainers-to-avoid-breaking-their-user-s-software-and-to-6edf06dc5617#.6yjw2gttx

This should replace `npm publish` in the script command `"semantic-release": "semantic-release pre && npm publish && semantic-release post"` command

Start by inspecting the package's semantic-release script and the existing bin entry points. Trace how the last commit message is available to the release command and verify the intended behavior against the linked issue; done means the bin script replaces npm publish and publishes under a TAG value when present.

Written by the indexing model from the issue text.