Fix bug 888897: Disabled jingo-minify's CACHEBUST_IMGS setting.

CACHEBUST_IMGS has a few bugs and doesn't actually correctly bust
the images. However, it does destroy the manual busting we did for
the new Firefox logo in the download buttons, which is sadness. Thus
we get rid of it like a bad habit.
Add no JS styles for newsletter and get phone forms bug 878871
Merge pull request #1010 from alexgibson/add-css-styles-for-forms-no-js-bug-878871

Add no JS styles for newsletter and get phone forms bug 878871