[Rakefile] Don't set the git user as not needed anymore

Rakefile

@@ -208,9 +208,6 @@ namespace :spec do
   #
   desc "Run all specs and build all examples"
   task :ci => :unpack_fixture_tarballs do
-    sh 'git config --global user.email "cocoapods@example.com"' if `git config user.email`.empty?
-    sh 'git config --global user.name "CocoaPods"' if `git config user.name`.empty?
-
     title 'Running the specs'
     sh "bundle exec bacon #{specs('**')}"