merb-dev sake tasks update

People mentioned today that the sake tasks were broken, so as of commit 123f1e13e96ba6d42cbb0d25554913ab9851cd6a in merb-more you should be good. I changed the installation of primarily the extlib library, and reordered things a bit. As Yehuda mentioned recently, when living on the edge things can be a bit unstable. The pain this may create now is a small price to pay for a 1.0 release thats solid and easily used by many, so please stay tuned and keep the comments coming in #merb.