Set development info in manifest
Add two new inversion schemes

 * Invert all images
 * Invert no images
Fix Facebook photos in noimg mode

Actually, a universal fix for any images specified in CSS in the noimg
mode.
Add low contrast option
Fix nested html

Recent CSS changes broke the special behavior for nested documents by
matching "nested_delumine*" the same as "delumine*". Use anchored CSS
matching to avoid that.
Fix full-screen Youtube videos
Comment up the increasingly complex CSS file
Fix Vimeo videos

Double-inversion caused by the video being a child of a div that had a
background-image set. So stop uninverting tags that set a background
image but also have children.
Correct double-uninvert of some Flash videos

Some Flash videos are marked up with an embed tag inside an object tag.
Work around this by only uninverting the innermost object/embed tag
(i.e., empty ones).

Fixes #1
Add a quick hack for Youtube stills

YouTube has an issue with the :empty requirement on tags that include
background images via CSS. It breaks the uninversion of the "videowall"
stills at the end of videos. This is a quick and dirty hack to fix it
until I can come up with a better solution in general to the
double-inversion problem.
Update README with latest features
Branch for release 0.3
Merge branch 'release-0.3'

Changelog:
 * New feature: options to invert all or no images
 * New feature: low-contrast mode universal option
 * Fix for Facebook photos being inverted
 * Fix for fullscreen YouTube being inverted and (other video sites too)