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This week's Ruby Quiz is to write a program that presents the user with Madlibs.
The script should ask the user for a series of words, then fill in the proper
places in the story using the user's answers.

We'll keep our story format very simple, using a ((...)) notation for
placeholders.  Here's an example:

	Our favorite language is ((a gemstone)).

If your program is fed that template, it should ask you to enter "a gemstone"
and then display your version of the story:

	Our favorite language is Ruby.

That covers the simple cases, but in some instances we may want to reuse an
answer.  For that, we'll introduce a way to name them:

	Our favorite language is ((gem:a gemstone)).  We think ((gem)) is better
	than ((a gemstone)).

With the above story, your program should ask for two gemstones, then substitute
the one designated by ((gem:...)) at ((gem)).  That would give results like:

	Our favorite language is Ruby.  We think Ruby is better than Emerald.

You can choose any interface you like, as long as person can interact with the
end result.  You can play around with my solution here:

	http://rubyquiz.com/cgi-bin/madlib.cgi

And here are the two Madlib files I'm using, to get you started:

	http://rubyquiz.com/madlibs/Lunch_Hungers.madlib

	http://rubyquiz.com/madlibs/Gift_Giving.madlib