Merge pull request #691 from code-dot-org/finished

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Improved footer layout down to 900px width desktop and 768px width @full_width.
Upgrade to universal Google Analytics.  Report two custom session dimensions: signed in & locale.
Better report signin & user-chosen language in analytics.
Make editor list k1 blocks NSEW
Merge pull request #729 from code-dot-org/make_nsew_editor

Make editor list k1 blocks in NSEW order [finishes #71447862]