Update how we do versioning

Right now there's a bundle of places where the version string gets updated. 
* package.json
* package-lock.json
* bower.json
* RELEASE_NOTES.md
* src/biokbase/__init__.py
* src/config.json
* src/config.json.templ

It would be ideal if there were a single source of real versioning and everything else is templated to use that.