* use katex from npm

* remove symlink

blaze upgraded from 2.2.1 to 2.3.0
blaze-html-templates upgraded from 1.0.5 to 1.1.0
caching-html-compiler upgraded from 1.0.7 to 1.1.0
kenton:accounts-sandstorm upgraded from 0.5.1 to 0.6.0
spacebars-compiler upgraded from 1.0.13 to 1.1.0
templating upgraded from 1.2.15 to 1.3.0
templating-compiler upgraded from 1.2.15 to 1.3.0
templating-runtime upgraded from 1.2.15 to 1.3.0
templating-tools upgraded from 1.0.5 to 1.1.0