Add arrows in both directions to axis labels.

[#52716799]

This also fixes a bug in the just-previous implementation, where arrows were only added to the label text if there was a unit.
Also update animation background on layer creation

[#52816745]

This fixes the "road" image not showing up in an activity served from the authoring site. The fix was to set the animation channel background image (and width) on layer creation as well as layer update. It seemed previously to be sufficient to set the background on layer update.
Reset index.rhtml to SC1.9.2 default

[#52817605]

Want to do this before customizing touch icon and favicon.
"Rebase" 2cc46795 (typekit) onto new index.rhtml

[#52817605]
"Rebase" 1883864c (GA) onto new index.rhtml

[#52817605]
Configure user-visible title to "SmartGraphs"
Add favicon

[#52817605]
Setup touch icons too

[#52817605]