Update dont-touch-dom.html.md so it reads better
Add twitter follow/tweet widgets on footer
Merge remote-tracking branch 'zeno/master'
Change 'text' to 'content' to keep the pattern
Add translation to pt-br for #209
Remove Twitter widget not accepted on PR
Update spanish translation

I maintained the References link, should I remove it?
Sample code for reverse iteration

https://github.com/zenorocha/browser-diet/issues/217
Add link to PerfCalendar
Fix assets path
Reorganize dependencies and Grunt tasks
Improve PerfCalendar link position
Add browser support
czech translation of browserdiet
Updated browser logo urls to fix missing IE logo

It looks like @alrra now maintains the browser-logos repo, and a [recent commit](https://github.com/alrra/browser-logos/commit/2105b14a1a304b691aeba8b9969e72b69d1aaab5) changed the name of the IE logo.
Updated EN and PT flags to use correct country flags
Added credit to GoSquared for flag icons in README.md
Source formatting #222
Merge branch 'pr-222'

Conflicts:
	src/documents/assets/img/flag-sprite.png
Remove SuperSanta