Greatly reduce scope of Color implmentation

Author: csuhta

lib/sassc.rb

@@ -18,6 +18,13 @@ module SassC
 require_relative "sassc/script/value/map"
 require_relative "sassc/script/functions"
 require_relative "sassc/script/value_conversion"
+require_relative "sassc/script/value_conversion/base"
+require_relative "sassc/script/value_conversion/string"
+require_relative "sassc/script/value_conversion/number"
+require_relative "sassc/script/value_conversion/color"
+require_relative "sassc/script/value_conversion/map"
+require_relative "sassc/script/value_conversion/list"
+require_relative "sassc/script/value_conversion/bool"
 require_relative "sassc/functions_handler"
 require_relative "sassc/dependency"
 require_relative "sassc/error"