sep#19 proposed changes
Merge pull request #705 from Curita/sep19-update

Per-spider settings and api cleanup: sep#19 update
add Julia to SEP-019 authors
grammatical issue
Merge pull request #711 from cerivera/master

grammatical issue
Elaborated request priority value.
Merge pull request #714 from andrewbaxter/master

Elaborated Request priority value in Scrapy docs
Merge remote-tracking branch 'upstream/master'