website/vimeo.lua: Mark as FIXME

Notes:
* http://thread.gmane.org/gmane.comp.web.flash.quvi/358
* Affects: {0.4, 0.9}

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
FIX: website/redtube.lua: media stream URL pattern

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
FIX: website/tcmag.lua: Media stream URL pattern

Other notable changes:
* Try to determine self-hosted/affiliate content from the stream URL
* Parse thumbnail URL

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
tests: default: tcmag.json: Update with thumbnail URL

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
website/arte.lua: Mark as FIXME

This has been addressed in the 0.9 series and awaits to be backported.

See also:
  * http://thread.gmane.org/gmane.comp.web.flash.quvi/356

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
Update NEWS for v0.4.20

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
Bump version to 0.4.20

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>