mspec

Title *

SummaryFixes for implementation guards

Description *Summary of changes: * The compliant_on, not_compliant_on guards now always run on MRI 1.8/1.9 * The not_supported_on, deviates_on, extended_on should only be used with alternative implementations * None of the implementation guards above should be used with platform designators like :windows or :java. * Adds <code>should have_method</code> matcher. See http://rubyspec.org/wiki/rubyspec/Guards for documentation on all the spec guards.