JSCS can be dumb sometimes
Use JS & Jade to generate the customizer variables form HTML from variables.less; fixes #11095

also updates variables file organization (courtesy @mdo)
add support for '//===' for <h3>s in bs-lessdoc
Merge pull request #11158 from twbs/templated-customizer

Autogenerate the customizer's variables form
grunt dist
grunt build-customizer
JSHint is on crack?

Linting docs/grunt/bs-raw-files-generator.js ...ERROR
[L3:C5] W079: Redefinition of 'btoa'.
var btoa = require('btoa')
bump grunt-contrib-jade to v0.9.1