fix some bugs when building examples

Gemfile

@@ -7,6 +7,7 @@ gem "rails", "~>3.0.0.rc"
 gem "compass-validator", "3.0.0"
 gem "css_parser", "~> 1.0.1"
 gem "sass"
+gem "haml", "~> 3.1.alpha"
 gem "rcov"
 gem "rubyzip"
 gem "livereload"

Rakefile

@@ -61,7 +61,7 @@ task :examples do
     puts "=" * "Compiling #{example}".length
     Dir.chdir example do
       load "bootstrap.rb" if File.exists?("bootstrap.rb")
-      Compass::Exec::SwitchUI.new(["--force"]).run!
+      Compass::Exec::SubCommandUI.new(%w(compile --force)).run!
     end
     # compile any haml templates to html
     FileList["#{example}/**/*.haml"].each do |haml_file|