made the "loader" gif background for oembed container
make videos autoplay after click

changed handlebars "avatar" helper to "personImage"; added home button to interaction pane (only when sneaky -- needs further investigating on getting it showing up when the interaction pane is invoked); minor css tweaks.

Revert "don't show nsfw posts without a shield in the viewer"

This reverts commit 722116ce.

make sneaky passive by default.  this fixes the bug where a user would like something when the interaction pane is active and the sneaky would show up when the feedback view was re-rendered.

display proper counts after feedback actions; modified destroy responses to return PostPresenter objects

DG RY; provide a background color to post author for legibility on post pages with background images