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For this, the tenth Ruby Quiz, let's tackle a classic problem.  I've seen it
just about everywhere in some form or another, but I believe Donald E. Knuth may
have first made it a popular challenge.

This week's quiz is to layout crossword puzzles.  A puzzle layout will be
provided in a file, who's name will be passed as a command-line argument.  Those
layouts will be formatted as such:

	X _ _ _ _ X X
	_ _ X _ _ _ _
	_ _ _ _ X _ _
	_ X _ _ X X X
	_ _ _ X _ _ _
	X _ _ _ _ _ X

Xs denote filled in squares and _s are where a puzzle worker would enter
letters.  Each row of the puzzle is on a new line.  The spaces are a readability
tool and should be ignored by your program.  In the final layout, these squares
should look like this:

	######  Filled in square
	######
	######
	######
	
	######  Letter square
	#    #
	#    #
	######

Now, when we combine these squares, we don't want to double up on borders, so:

	_ _
	X _

should become:

	###########
	#    #    #
	#    #    #
	###########
	######    #
	######    #
	###########

As a style point, many crosswords drop filled squares on the outer edges.  We
wouldn't want our Ruby generated crosswords to be unfashionable so we better do
that too.

	X _ X
	_ _ _

Would render as:

	     ######     
	     #    #     
	     #    #     
	################
	#    #    #    #
	#    #    #    #
	################

The final step of laying out a crossword puzzle is to number the squares for
word placement.  A square is numbered if it is the first square in a word going
left to right or top to bottom.  Numbers start at 1 and count up left to right,
row by row going down.

Putting all that together, here is a sample layout.  (This was generated from
the layout format at the top of this quiz.)

	     #####################          
	     #1   #    #2   #3   #          
	     #    #    #    #    #          
	####################################
	#4   #    ######5   #    #6   #7   #
	#    #    ######    #    #    #    #
	####################################
	#8   #    #9   #    #    #10  #    #
	#    #    #    #    #    #    #    #
	#####################    ###########
	#    ######11  #    #               
	#    ######    #    #               
	####################################
	#12  #13  #    ######14  #15  #    #
	#    #    #    ######    #    #    #
	####################################
	     #16  #    #    #    #    #     
	     #    #    #    #    #    #     
	     ##########################     

Solutions should output (only) the finished crossword to STDOUT.