Fixed pinterest.com for https
Sites: added patch.com; added aol.com news.
Improved debug log.
Version 2.1a1.  Added yelp, tripadvisor, flipkey.com
No functional change; shortened const to 'EXTS'.
Added options.js (which is for v2.0 but was missing) and doc Similar_Addons.html
Bug fix: was showing popup even when not bigger than thumb when thumb had no
file type but image did (eg redditp.com for imgur links)

Also updated TestCases.html.
Version 2.1beta1

Changed Homepage URL in add-on manager from wordpress to mozilla add-on site.
Fixed prior Bug fix for: was showing popup even when not bigger than thumb when thumb had no
file type but image did (eg redditp.com for imgur links)
It now looks at the background-image style when determining
the thumb's file type.
Generalized wp-content rule in Thumbnails
Now supports thumbs on vimeo.com and dailymotion.com
Version 2.1rc1
Version 2.1rc2.  Added tooltip for 'Show pictures using all available space'.
Improved "Add to History": adds not just the image's URL to history
but also the original provoking node's URL.
Implemented Liked Page Analyzer aka ScanLinkedPage aka "scraper".

It reads the target of a link as html and parses it to find
the appropriate image to display.  This is slower than prior methods
since it must read an additional html page but for some sites
it's the only way to show a popup.

It's enabled only for specific sites (by regexp).  Specific regular expression
rules and CSS selectors parse the html.

Issues:
- loads html synchronously, which may make the user wait if the
site is slow -- potentially many seconds.  It also causes lost clicks and keypresses
during that wait.

- it runs in its own rule between Others and Thumbnails, but
ideally we'd split up Thumbnails to run most of Thumbnails first,
but the part of Thumbnails which shows a low-rez thumb after.
If a link matches the regexp for ScanLinkPage it'll take the
time to run ScanLinkPage, even if it would have also matched
an effective rule in Thumbnails page.

- it'd be useful to run something like the Others or Thumbnails
rule on the result of the ScanLinkedPage rule, to transform
the link we found into a higher-rez one.

Fixes #50: Support ebay.com.
Bigger images are available than what we're using; we may be
able to get them if we post-process the image url found via ScanLinkedPage.
Suported pages include items, users, and deals.

Fixes #27: Support flickr home page Explore thumbs & page URLs

Works for Explore icons and also arbitrary links to flickr pages.

Fixes #17: Support links to other video sites
Adds support for vimeo.com, liveleak.com, blip.tv.
Added support dailymotion.com, etc. links

Added support for vimeo.com and dailymotion.com thumbnails
in Thumbnails rule.

Added support for imgur.com/a/ (galleries, showing the 1st image)

Added support for 500px.com non-thumbnail links.

Fixes #64: Support links to instagr.am pages (not thumbs)
Fixes #63: Support links to yfrog.com pages (not thumbs

Added support in ScanLinkedPage rule for instagram.com, instagr.am,
lockerz.com, yfrog.com.

Also added limited support for instagram and yfrog links
directly to images in Others rule.

Pages now support optional imageDisallowRegExp.

Updated TestCases.html.