Add semantic-release to the project

[markhalliwell]

https://github.com/semantic-release/semantic-release

This is an automation tool that helps fully automated package publishing:
https://www.npmjs.com/package/ajax-bootstrap-select

Setting this up isn't exactly a walk in the park, but once it's done, it'll make "deploying" this project a thing of the past.

This is semi-dependent on #115?

[markhalliwell]

Also, adding this process will need to be the last step before making an official 2.0.0 release.