Add Nokogumbo dependency
Don't wrap `<template>` tags
Parse with Nokogumbo

Instead of Nokogiri
Rename variable in `to_s` method of Document
Use `inner_html` instead of `children.to_s`

Returns the intended html
Add wrap data to be parsed in `<html`>/`<body>` tags

Prevents css and scripts from being removed from the <body> and added
to the <head>
Don't require Nokogiri in Document
Remove unnecessary variable
Merge branch 'change-parser' into fix-template-parsing