add magic encoding comments to all ruby source files

lib/yard/templates/default/module/dot/setup.rb

@@ -1,3 +1,5 @@
+# encoding: utf-8
+
 def init
   @modules = object.children.select {|o| o.type == :module }
   @classes = object.children.select {|o| o.type == :class }

lib/yard/templates/default/module/setup.rb

@@ -1,3 +1,5 @@
+# encoding: utf-8
+
 include Helpers::ModuleHelper
 
 def init

lib/yard/templates/default/module/text/setup.rb

@@ -1,3 +1,5 @@
+# encoding: utf-8
+
 def init
   sections :header, [T('docstring')], :children, :includes, :extends,
     :class_meths_list, :instance_meths_list