SB 00000 wiki update

This PR includes support for a new rake task: "qa:release:wiki_update".  It's similar to the existing "qa:release:wiki" task, but prompts for a few more inputs, generates a complete wiki page, and updates the wiki.
Please merge so that we can publish a new version of the gem and start using the new rake task during the short term while we continue to work out longer term changes to the release workflow.