Merge pull request #1155 from emmanuel-keller/master

Bug fix and improvement
Documentation: add parsers
Documentation: fix typo
Merge pull request #1157 from AlexandreToyer/master

Documentation: add parsers
Documentation: add details, fix typo
Merge pull request #1158 from AlexandreToyer/master

Documentation: add details, fix typo
Update parse_upload_file.md

Use data-binary to avoid chunk issue. The content type is not required.
Merge remote-tracking branch 'upstream/master'
the pop3 crawler did not retrieve the right messageid
sync issue with thread