Re: RubyExcel class. Useful?

Good point Andrew. Writing a thorough demo is a good way to 
systematically test every method as well.
I just tried to demo some of the newer stuff I added and I've already 
found a couple of bugs where I have class methods referenced rather than 
the mix-in methods I changed to recently. I'll run a thorough series of 
tests, build up some examples, and then try again.

This covers some of the basics anyway:

irb(main):002:0> re = RubyExcel.new.test
=> RubyExcel => columns: 4, rows: 6, values: 24
irb(main):003:0> puts re
a       b       c       d
e       f       g       h
i       j       k       l
m       n       o       p
q       r       s       t
u       v       w       x
=> nil
irb(main):004:0> re['B2'] = 'z'
=> "z"
irb(main):005:0> re.column_by_header('c').map! { |el| el.next }
=> Class: RubyExcel::Column, Index: C
irb(main):006:0> puts re
a       b       d       d
e       z       h       h
i       j       l       l
m       n       p       p
q       r       t       t
u       v       x       x
=> nil
irb(main):007:0> re.delete_column('D')
=> RubyExcel => columns: 3, rows: 6, values: 18
irb(main):008:0> re.cell(2,3).value = 'z'
=> "z"
irb(main):009:0> puts re
a       b       d
e       z       z
i       j       l
m       n       p
q       r       t
u       v       x
=> nil
irb(main):010:0> re += [ %w(1 2 3) ]
=> RubyExcel => columns: 3, rows: 7, values: 21
irb(main):011:0> puts re
a       b       d
e       z       z
i       j       l
m       n       p
q       r       t
u       v       x
1       2       3
=> nil
irb(main):012:0> re.filter!('b') { |el| el =~ /[a-r]/ }
=> RubyExcel => columns: 3, rows: 4, values: 12
irb(main):013:0> puts re
a       b       d
i       j       l
m       n       p
q       r       t
=> nil
irb(main):014:0> re.row(2)['A'] =  'q'
=> "q"
irb(main):015:0> re.summarise 'a'
=> {"q"=>2, "m"=>1}
irb(main):016:0> puts re
a       b       d
q       j       l
m       n       p
q       r       t
=> nil
irb(main):017:0> puts re.uniq! 'a'
a       b       d
q       j       l
m       n       p
=> nil

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