upgrade to ruby 2.0.0
 update ruby version
Display tag sub update info on delayed jobs page
fixes #530
fixes #1124
Merge branch 'ruby-2.1'

Conflicts:
	app/assets/javascripts/comments.js
	app/helpers/delayed_jobs_helper.rb
Revert "Merge branch 'ruby-2.1'"

This reverts commit 18dd5acca7873288ea79360ffaa4902ca18963a7, reversing
changes made to 55fef2f7c68c9d1cf28701754ccdd4e6b7fc3aec.
bug fixes