:revolving_hearts: Checks if kanji has subcategory, delegates into container
:whale: Subcategories add to Categories, WaniKani adds each level
Fix creation of WaniKani level subcategories (i.e. clone() ).
$subCategory object is being repeatedly modified, and append() keeps moving the object within the DOM.  Adding clone() creates a new object for each subcategory.
Merge pull request #19 from rfindley/wani-levels

Fix: Add 'clone()' to creation of WaniKani level subcategories
Merge pull request #18 from jensechu/wani-levels

Support Subcategories in Kanji Categories