v0.16.1

Fixed

• vapor_split/1 no longer drops slots when a text node comes before an element. Vapor counts text nodes when it navigates the template, so in <li>a<ul><li>{{ b }}</li></ul></li> the split looked for the wrong element and silently left {{ b }} out. Elements are now located by their DOM node position.
• vapor_split/1 returns an error if it can't locate an element a slot or binding belongs to, instead of leaving the slot out.