Rails 3.1

Forked branch and added gemspecs to activemodel, activerecord, and remarkable. I'm sure the gemspecs will need to be cleaned up a little - and the version is now 4.0.0.alpha5 - but other than that it should work. At minimum with " gem 'remarkable', :git => 'git://github.com/[user]/remarkable.git, :branch => 'rails-3.1' " in the bundler file.