[Sass] Vendor FSSM as a submodule.

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "test/haml/spec"]
 	path = test/haml/spec
 	url = git://github.com/norman/haml-spec.git
+[submodule "vendor/fssm"]
+	path = vendor/fssm
+	url = git://github.com/ttilley/fssm

lib/sass.rb

@@ -20,5 +20,9 @@ module Sass
 end
 
 require 'haml/util'
+
+dir = Haml::Util.scope("vendor/fssm/lib")
+$LOAD_PATH.unshift dir unless $LOAD_PATH.include?(dir)
+
 require 'sass/engine'
 require 'sass/plugin' if defined?(Merb::Plugins)