Mathquill editable inserts into CKEditor working

Mathquill editable boxes can now successfully be insterted into CKEditor
inline contentEditable blocks. Steps: Added a general CKEditor inline editor at
the top to test, then moved the Mathquill button below the
contentEditable to make it visible, then changed the DOM div id from test
because CKEditor changed it to ContentEditible-2. Still need to clean up
code. RE: Issue #3