Remove "Piclens + Local Tumblr" Action

Piclens/Cooliris/Cooliris 3D Wall no longer exists.
https://addons.mozilla.org/en-US/firefox/addon/cooliris/

And, it seems that this action doesn't work even if install CoolPreviews.
https://addons.mozilla.org/en-US/firefox/addon/coolpreviews/
Update README.md
Regression(@80a6f2846a): Fix "Video - YouTube" Extractor #73

Full Commit ID: 80a6f2846a270e7cdf7594dea32b9896ada55dcd

YouTube's Canonical Link should be ignored.

Close #73
Fix extensions.tombfix.ignoreCanonical