Various fixes.
Update the dates for articles.
Merge pull request #766 from umaar/various-fixes

Various fixes.
Merge pull request #765 from chenxsan/master

Translate index.html under `fundamentals` folder into Chinese
Making config single site

This one needs to be single site so make server works - @paulkinlan is
this one needed for the appengine build? It would be much better to have
that served off a different config if so so that simple jekyll builds
work OK!