The Mustache highlighting has been modified, so as to also highlight template files and make it more complete (previously, this highlighter was only used within HTML highlighting, in the <script> tag).
I have taken as reference the Mustache highlight files for Vim  and Atom , and the documentation of Musatche and Handlebars.
- Highlight full HTML files, such as Mustache templates. That is, the highlighter is now not hidden, but it's applied to Mustache/Handlebars/Ractive template files.
- Rename: MustacheJS -> Mustache/Handlebars (HTML)
- Improve support for Handlebars .
- In 'html.xml', also highlight HTML templates in the <script> tags (with type="text/html") .