Add defer attribute to javascript_include_tag Rails

javascript ruby-on-rails ruby-on-rails-3 ruby-on-rails-3.1 deferred-execution

<%= javascript_include_tag "blah.js", :defer => "defer" %>

This will get you (in development):

<script defer="defer" src="/assets/blah.js" type="text/javascript"></script>

javascript ruby-on-rails ruby-on-rails-3 ruby-on-rails-3.1 deferred-execution

You can also do

<%= javascript_include_tag "blah.js", defer: true %>

which is more consistent with other switches.

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