Fixed spec for singleton class of a Bignum.
Fixed spec for singleton class of a Bignum.

Notes:
* Use bignum_value helper when needing a Bignum instance in the specs.
* Never use 'should_not raise_error' unless there is no possible other
  way to write the spec. Any computation that does not raise an error
  would satisfy the expectation. In other words, there is no meaningful
  spec distinction between the following examples:

    lambda { 1 }.should_not raise_error
    lambda { some_complex_computation }.should_not raise_error

  Instead of 'should_not raise_error', use the value of the computation
  in the expectation. Otherwise, use an expectation on a method being
  called, or when spec'ing control flow or side effects, use values added
  to the ScratchPad helper.

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