Add additional textmate scopes

[epiqu1n]

Please add more grammars/textmate scopes. Specifically I would like to be able to separately identify and highlight the tags for true sections: {{#a}} {{/a}}, false sections: {{^b}} {{/b}}, escaped varaibles: {{a}}, and unescaped variables: {{{a}}}.

Currently, when viewing tags with the Scope Inspector, all Mustache elements only show up as "entity.tag.name.mustache", like so:

I tried settings this up on my own via grammar injection but could not get it to work.