Upgrade to Universal Google Analytics

Use the latest tracking code as recommended by Google, and update the function that sends the info to GA.

Remove google-analytics-manager because I don't think we need to load and initialize yet another extra JS file when all you need is an onclick in the anchor tag.
Merge pull request #29 from smcgov/update-google-analytics

Update google analytics. 
Sounds good. A few FYI notes: modules are combined together so each module != a separate file request. Also, inline JS is not generally recommended because it's not unobtrusive JS (http://edgeguides.rubyonrails.org/working_with_javascript_in_rails.html#unobtrusive-javascript).