Adding Ruby block comment syntax.

Working towards GH-22.

lib/rocco.rb

@@ -209,7 +209,7 @@ class Rocco
         "js"            =>  { :single => "//",  :multi => { :start => "/**",    :middle => "*", :end => "*/" } },
         "lua"           =>  { :single => "--",  :multi => nil },
         "python"        =>  { :single => "#",   :multi => { :start => '"""',    :middle => nil, :end => '"""' } },
-        "rb"            =>  { :single => "#",   :multi => nil },
+        "rb"            =>  { :single => "#",   :multi => { :start => '=begin', :middle => nil, :end => '=end' } },
         "scheme"        =>  { :single => ";;",  :multi => nil },
       }