* swap `sanitize-html` for `dompurify`
* set up node enzyme tests with jsdom
dompurify, as the name suggests, needs a DOM or it won't work!
* reconcile tests and sanitizer settings
* remove obsolete sanitizeOptions
* add `jsdom` dependency
* Add UnitTest for images
allows image elements with https scheme
* Test images with data scheme
* Add allowedSchemesByTag
* Fix error Strings must use doublequote quotes