Fixed #166: Horizontal episemas insert properly
Fixed #166: Horizontal episemas insert properly

Horizontal Episemas now insert properly on all document types. Also Removed the possibility of Horizontal Episemas being inserted at the bottom of the neume since this will never happen.

DDMAL/Neon.js,DDMAL/Neon.js,DDMAL/Neon.js,DDMAL/Neon.js