Add a command to list available frameworks.

lib/compass/commands/list_frameworks.rb

@@ -0,0 +1,16 @@
+module Compass
+  module Commands
+    class ListFrameworks
+      attr_accessor :options
+      def initialize(working_directory, options)
+        self.options = options
+      end
+  
+      def perform
+        Compass::Frameworks::ALL.each do |framework|
+          puts framework.name
+        end
+      end
+    end
+  end
+end

lib/compass/exec.rb

@@ -108,6 +108,10 @@ END
           self.options[:framework] = framework
         end
 
+        opts.on('--list-frameworks', "List compass frameworks available to use.") do
+          self.options[:command] = :list_frameworks
+        end
+
         opts.on('-e ENV', '--environment ENV', [:development, :production], 'Use sensible defaults for your current environment: development, production (default)') do |env|
           self.options[:environment] = env
         end