[doc] draft of "just enough python for etl" appendix.
added cached file extract
new lines not removed in non html string in filter_html
Merge pull request #5 from jmorel/filter_html_new_lines

new lines not removed in non html string in filter_html
Merge pull request #6 from jmorel/cached_file_extract

added cached file extract
Merge remote-tracking branch 'origin/master' into dev
Merge commit '30965ad' into dev
[cli] allow terminals without set width (like pycharms)