Add explit require

to resolve possible autoload error.

close #1001

lib/haml/attribute_parser.rb

@@ -3,6 +3,7 @@ begin
   require 'ripper'
 rescue LoadError
 end
+require 'temple/static_analyzer'
 
 module Haml
   # Haml::AttriubuteParser parses Hash literal to { String (key name) => String (value literal) }.