`:example` and `:group` scope aliases

As per a discussion on the mailing list [1], Evgeniy D.
suggested that if we were going to have aliases, it would be optimal
to have a change that introduced the aliases of :example, and :group,
to parallel the existing :suite alias.

I’ve created a pull request that does this. It is here:

[1]
http://groups.google.com/group/rspec/browse_thread/thread/26ea96043f46b3b6

~ jf

John F.
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