update makefile and Contributing.md
update scripts/
make publish
Merge branch 'master' into docs5.0-ready

- after Chuck's add-ons
Ready 2 NB for plot.ly!

- overviewpub.ipynb -> user-guide/
- plotlystreampub.html -> streaming-tutorial/
- add strip_title in publish.py
- modif strip_last_pre in publish.py
- better make_config.py
modif streaming-tutorial meta descrip
Merge pull request #5 from plotly/docs5.0-ready

Docs5.0 ready