Merge pull request #962 from emmanuel-keller/master

Fix #959, and add support of escape
Update how_lang_of_webpages_are_detected.md

Rewording for clarity/language.
Update how_lang_of_webpages_are_detected.md

I had forgotten to fix the title.
Update how_to_exclude_some_part_of_webpage_from_crawling.md

Language fixes.
Update how_to_use_more_like_this_feature.md

Language/clarity improvements.
Update how_to_parse_YouTube_URLs_and_extract_data.md

Language/clarity improvements.
Merge pull request #966 from emmanuel-keller/master

Mailbox improvements
Merge pull request #970 from emmanuel-keller/master

Implements #967
Documentation: add page for relevancy with MirorANDFilter
Documentation: fix typos
Merge pull request #971 from AlexandreToyer/master

Documentation: add page for relevancy with MirorANDFilter
Merge pull request #978 from emmanuel-keller/master

Bug fix and improvement
Merge pull request #982 from emmanuel-keller/master

Implements #979
Merge pull request #988 from emmanuel-keller/master

Bug fix and improvement
Merge pull request #989 from emmanuel-keller/master

Fix sync with 1.5 branch
Merge pull request #993 from emmanuel-keller/master

Implements #990
Update and rename improving_relevancy_with_mirorandfilter.md to improving_relevancy_with_mirrorandfilter.md

Language fixes, rewording, clarity.
Update improving_relevancy_with_mirrorandfilter.md

Fixed a formatting glitch.
Update SUMMARY.md

Fixed missing "r" to "mirror".
Update README.md

Fixed missing "r" to "mirror".