Updated comment for profane_words_in
Created Emailable concern
Moved Emailable related tests to concerns/emailable_spec
Added Draper gem and configured for spork

Per Draper instructions for spork, added
  require 'draper/test/rspec_integration'
to spec_helper.rb
Created MicropostDecorator posted_ago

DRYs up code where printing how long ago a post was created.