Update httperror.py

Log ignored HTTP pages when the response code is not allowed or not configured to be handled.
Update scrapy command line doc with additional scrapy parse options
SpiderMW doc typo: SWP request, response
Running lucasdemarchi/codespell to fix typos in docs
Running lucasdemarchi/codespell to fix typos in SEPs
Running lucasdemarchi/codespell to fix typos in code
Merge pull request #628 from barraponto/codespell

Using lucasdemarchi/codespell to fix typos
Converted sep-001 to rst format
converted sep 002 to rst
- decided that removing files would cause conflicts on merge
- readded file to prevent future merge conflicts
converted sep 3 for #629
sep 4 for #629
sep 11 for #629
- sep 15 for #629
 sep 6 for #629
- sep 10 for #629
- didn't like the way blockquotes rendered
- trying to separate quote context
- changing indentation so contexts are recognized