js-beautify support for mustache and handlebars

[abgeana]

The mustache/vim-mustache-handlebars plugin sets the filetype to either
html.handlebars or html.mustache. Even though js-beautify supports
formatting for these files, the --type parameter must be html.

This commit sets the --type parameter to html when the filetype
matches the regex html\..*.

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[abgeana]

@googlebot I signed it!

[abgeana]

CI is still failing, but I see in the tests for js-beautify are fine this time. The problem is with another formatter I think.

[dbarnett]

CI is still failing, but I see in the tests for js-beautify are fine this time. The problem is with another formatter I think.

Interesting, looks like #167 and for some reason Travis never ran on that. I'll look into it.

EDIT: I have PR #171 to fix the test issues.

[dbarnett]

This loose matching includes some patterns you might not have intended. Consider changing it to something like

&filetype is# 'html' || &filetype =~# '\mhtml\.'

Without the # the behavior subtly depends on the 'ignorecase' setting, and the loose .* will match on characters that aren't a literal dot, such as some weird htmlos filetype vim has that doesn't seem to be anything like actual HTML syntax.

[dbarnett]

Was this line here by accident? It's "harmless" but has no effect.

[abgeana]

I addressed the two changes you requested and also squashed the commits to make history nicer. Let me know if this works.

[dbarnett]

Thanks, merging!