Merge branch 'unify-lib-tasks' into 'master'

Unify flay.rake and gettext.rake from EE

See merge request gitlab-org/gitlab-ce!20041

lib/tasks/flay.rake

 desc 'Code duplication analyze via flay'
 task :flay do
-  output = `bundle exec flay --mass 35 app/ lib/gitlab/ 2> #{File::NULL}`
+  output = `bundle exec flay --mass 35 app/ lib/gitlab/ ee/ 2> #{File::NULL}`
 
   if output.include?("Similar code found") || output.include?("IDENTICAL code found")
     puts output

lib/tasks/gettext.rake

@@ -4,7 +4,7 @@ namespace :gettext do
   # Customize list of translatable files
   # See: https://github.com/grosser/gettext_i18n_rails#customizing-list-of-translatable-files
   def files_to_translate
-    folders = %W(app lib config #{locale_path}).join(',')
+    folders = %W(ee app lib config #{locale_path}).join(',')
     exts = %w(rb erb haml slim rhtml js jsx vue handlebars hbs mustache).join(',')
 
     Dir.glob(