Updated Bignum#<=> specs.
Updated Bignum#<=> specs.

Notes:
* Use nested describes to group related specs.
* Separate specs for data with different classes (ie. don't
  put specs for Fixnum and Bignum values together). This is
  based on the principle that failing specs should not mask
  other passing specs. In other words, if specs are together
  in an example block, all should fail or pass. This is a
  relaxation of the one spec per example rule.
* Use the simplest data in the spec that will work.
* Use bignum_value and infinity_value helpers.

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