It doesn't matter where you place your jQuery scripts

From: http://railsapps.github.io/rails-javascript-include-external.html

"a word about persistent folklore. You may have encountered the frequently repeated advice to “always place JavaScript at the bottom of the page just before the closing </body> tag”. This was once true because web browsers loaded scripts sequentially and blocked loading and rendering until each script was complete. This is no longer true; modern browsers do “preload scanning” and begin loading all scripts in parallel, whether listed in the head element or at the bottom of the page. External JavaScript often is loaded asynchronously and is written so it won’t execute until the page is loaded and the DOM is ready. Loading a script in the head element is no longer a bad practice.