Several updates re: Google Analytics and page body tags

The GA Tracking ID has been moved to a variable at the top of the
document since it is used in multiple places.

We've made minor changes to the body class property (eliminating
irrational primary### and secondary### on the home page, adding a depth
param on pages other than the home page).

We have put the body class property in a variable so it can be re-used

We are passing the body class property to TinyMCE in the two bucket
handlers

We've switch to our new googleAnalytics template instead of hardcoding.
Oops, forgot to add class to aside tag