Feature: Add ability to not filter class and id properties.

## Ready State: Yes

Adds the ability for class and id attributes to be applied to elements that are run through the htmlpurifier filter.

## Requirements & Dependencies

* None

## Deployment Instructions

* Merge code.
* Revert `imagex_wysiwyg_profiles`: `drush fr imagex_wysiwyg_profiles`
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* Verify setting took hold in htmlpurifier configuration on /admin/config/content/formats/filtered_html