Fix glob for #initialize to use the proper format

* The previous statement would not match any files at all.

config/flay.yml

@@ -1,3 +1,3 @@
 ---
 threshold: 16
-total_score: 614
+total_score: 607

lib/mutant/strategy/rspec/dm2/lookup/method.rb

@@ -106,11 +106,12 @@ module Mutant
               # @api private
               #
               def glob_expression
+                glob_expression = super
                 if method_name == :initialize and !public?
-                  return "#{private_glob_expression} #{base_path}/class_methods/new_spec.rb"
+                  "{#{glob_expression},#{base_path}/class_methods/new_spec.rb}"
+                else
+                  glob_expression
                 end
-
-                super
               end
 
             end # Instance

spec/unit/mutant/strategy/rspec/dm2/lookup/method/instance/spec_files_spec.rb

@@ -43,7 +43,7 @@ describe Mutant::Strategy::Rspec::DM2::Lookup::Method::Instance, '#spec_files' d
 
     context 'initialize' do
       let(:method_name)              { :initialize                                                         }
-      let(:expected_glob_expression) { 'spec/unit/foo/*_spec.rb spec/unit/foo/class_methods/new_spec.rb' }
+      let(:expected_glob_expression) { '{spec/unit/foo/*_spec.rb,spec/unit/foo/class_methods/new_spec.rb}' }
 
       it_should_behave_like this_example_group
     end