rbenv / ruby 1.9.2 / ring link changes

This is a multi patch PR with changes to:

1) Ignore a file added by rbenv.
2) Allow ruby 1.9.2 to print the error when unzip is not installed.  Previously would error with `no method +` for the error when building the human friendly message.
3) Change ring links to point to the new ring repo.  There is a news post that points to the old repo I left unchanged, as you might want those preserved as is.