Cruisecontrolrb Cruise Control.rb

From Alberts email: This adds rudimentary support for [monotone](http://venge.net/monotone) Not that tested, but I have set it up, and it seems to work. Any comments? A couple of issues I ran into with monotone was: * Being a distributed scm, it has to have access to a local database, and not an url * It can have multiple heads * It does not have integer as revisions (thus sorting becomes an annoyance) First one is easy, but the other ones really need changes in related code outside of the scm-particular classes. Also, one have to configure in the cruise_config.rb to handle another scm to make this work. Perhaps not optimal, since the initial setup includes that information. Perhaps some yml-file for scm?