[Rails] Why can't get remote javascript libraries on Rails 4

In rails 3, I included this line:
<%= javascript_include_tag "http://cdn.leafletjs.com/leaflet-0.5.1/leaflet.js" %>

But when migrate to rails 4, its not posible and I get the next error:
Invalid argument - C:/Ruby193/findiner/app/assets/javascripts/http://cdn.leafletjs.com/leaflet-0.5.1

So far, I won't be able to get remote libraries. Thanks for help!

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