So I'm trying to figure out how I can allow an end user to decide which
modules to mixin to a instance of a class, but I'm not sure if it's
possible. An example of what I would like.

module Thing
  @bar = 5
end

class Foo
  def initialize
    @bar = 0
    @foo = 2
  end
end

class FooBar < Foo
  def initialize(*modules)
    @bar = 1
    modules.each do |module_name|
      eval("include #{module_name.to_s.capitalize}")
    end
  end
end

test = FooBar.new(:thing)

In the previous example, test would be an instance of FooBar, and it's
@bar would be 5 (from the module Thing), and it's @foo would be 2, from
it's superclass. Is that possible? The previous returns a nomethoderror
for "include" in the instance of test. And it might have several other
errors since I just typed it up.
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