mspec

Title *

SummaryAdds better support for running the combined 1.8/1.9 specs.

Description *Summary of changes: * Adds BackgroundGuard that is enabled with the <code>--background</code> command line option. This guard is used for specs that may block if run in a background process (e.g. library/readline) * Adds <code>--prefix</code> command line option the specifies a string to append to potential file names when resolving spec files. * Adds <code>-C, --chdir DIR</code> command line option that changes the working directory to DIR before running the specs. * Adds spec collections to the config file that can be used to run the correct specs for a particular version. For example, <code>mspec :library</code> will run the appropriate library specs. RubySpec has updated ruby.1.8.mspec and ruby.1.9.mspec files that set :core, :library, and :language correctly.