Update 04/11/2017:
Last update includes version for UE 4.18 along some improvements and fixes on all versions:
-Fixed a display bug that ocurred in the Mirror Table editor which involved undoing a removal or addition of a bone to the mirror table which caused all of the bones to display blank.
-Now using the Mirror Table from skeleton you don’t need to specify that the substrings are prefixes or suffixes, as it now accepts substrings that can be anywhere on the name of the bone (example of this is: " Finger_Left_01", with “Left” being the substring).
-Added a class icon and thumbnail for the Mirror Table asset.