Update ruby-rspec to 1.3.1.

=== Version 1.3.1 / 2010-10-09

* enhancements
  * Array =~ matcher works with subclasses of Array (Matthew Peychich & Pat Maddox)
  * config.suppress_deprecation_warnings!

* bug fixes
  * QuitBacktraceTweaker no longer eats all paths with 'lib'
    (Tim Harper - #912)
  * Fix delegation of stubbed values on superclass class-level methods.
    (Scott Taylor - #496 - #957)
  * Fix pending to work with ruby-1.9

* deprecations
  * share_as (will be removed from rspec-core-2.0)
  * simple_matcher (will be removed from rspec-core-2.0)

(taca)