Remove overlay animations completely.

They're just too slow, especially on pages with heavy image content.
Fix regex greediness on xray bar insertion
Separate broken JST augmentation and disable for now

Augmenting JST is more difficult than server-side templates. If I
augment before compilation, the template may not support HTML comments w/o
special syntax (haml, slim). After compilation, it's a javascript function, so.
Rails instrumentation fix

The render_template.action_view event could be fired multiple times
in a single request, it turns out. This should be a naive fix for that.