closes #31

wpackagist-plugin/katex 2.1.2 -> 2.2.1
wpackagist-plugin/wp-piwik 1.0.25 -> 1.0.26
wpackagist-plugin/disable-emojis 1.7.2 -> 1.7.3

wpackagist-theme/twentyeleven 3.8 -> 3.9
wpackagist-theme/twentyten 3.4 -> 3.5
wpackagist-theme/twentytwelve 3.4 -> 3.5

This reverts commit b37eacc1.

This reverts commit 807742d1.

We have now a must-use plugin which prevents Google Fonts from being loaded,
so these should not be necessary anymore (see #25).

I had messed up them, completely deleting the theme's functions.php file. This should fix #22.