* wip proposal still contains commented old code - tests are missing
* rename isTagNameSafe to makeTagNameSafe
* remove comments
* remove redundant space
* add htmlCustomPrimitives to the $tw.config object
* remove tag-sanitation from element.js
* WIP - add html-element sanitation to the new makeTagNameSafe function, so it can be used globally
* simplify sanitation logic and fix inline docs
* Move top comment into inline comments