[rtlnow] Simplify
[extractor/common] Encode the url when calculating the md5 with `—write-pages` option

This doesn’t cause any problem in python 2.*, but on python 3 the `md5` function only accepts bytes.
Some pep8 style fixes
[youtube:toplist] Make the regex for finding the playlist link more flexible

`title={foo}` may not be at the end of the `href` string.
[test/youtube_lists] Change the list used for testing the Top Lists extractor

The ‘Top tracks’ list is not always present in the channel page
[youtube] Use https: in more urls
[youtube] Encode the data when submitting the form for confirming the age

Needed on python 3