Article about first commits.

Also making links recognisable by colouring them blue.
Add nginx to first-commits article
Improvements as per Tom's comments
Add Go and Django.

+ consistent whitespace
+ fix authors field
+ mark ipython-notebook article as draft.
Disable CATEGORY_FEED_ATOM for now.

It breaks when we have no categories because pelican
tries to write the category  twice.
Rephrase + spell-fix severl parts after proof-reading.
Consistent heading + conclusion.
Merge branch 'master' into first-commits

Conflicts:
	content/articles/the-ipython-notebook-is-for-everyone.md
	hogwarts/scss/_article.scss
	hogwarts/scss/_base.scss
	hogwarts/static/css/blog.css
	publishconf.py