Add after_{create,update,delete}_commit callbacks to observers #81
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Rails 5 adds
after_{create,update,delete}_commit
callback aliases. See:https://blog.bigbinary.com/2016/05/11/rails-5-adds-after_create-aliases.html
This PR makes these callbacks available in observers. Includes tests to verify the callbacks were added properly. This also maintains backwards compatibility with Rails 4.