Document the release process in CONTRIBUTING.md (#139)
Document the release process in CONTRIBUTING.md (#139)

* Document the release process in CONTRIBUTING.md

These steps were assembled from the comments in:

* https://github.com/OctoLinker/browser-extension/pull/136
* https://github.com/OctoLinker/browser-extension/pull/137
* https://github.com/OctoLinker/browser-extension/pull/138

* CONTRIBUTING.md: Add commit log link

See https://github.com/OctoLinker/browser-extension/pull/139#discussion_r73094885

OctoLinker/browser-extension,josephfrazier/browser-extension,OctoLinker/browser-extension,josephfrazier/browser-extension,OctoLinker/browser-extension,josephfrazier/browser-extension