Recognize function bodies

[pchaigno]

With this pull request, function and method bodies will be recognized under the scopes meta.function.js and meta.method.js with the headers.
This is a necessary step to then recognize objects.

[pchaigno]

@50Wliu Travis build fixed!

[MaximSokolov]

Hmm. All languages use meta.function scope only for function declaration. TextMate manual says that meta.function match function declaration:

... For example the entire line which declares a function would be meta.function...

I doubt we should change it.

I proposed meta.function-call and meta.method-call scopes expecting that meta.function would match functions' declarations. So if we merge this PR this code:

.meta.function {
  .entity.name.function {
      color: @color1;
  }
}

... would also highlight functions/methods calls:

function() {
  // `functionCall` would be highlighted
  // I assume `functionCall` is `entity.name.function`
  functionCall();
}

I suggest to add new scope under meta.* for functions' bodies.

[winstliu]

Can we just make function-params also have the => part? Seems like a win-win. In addition, ( x => doesn't seem valid to me. x => or (x) => should be the only two that are valid, but I'm not exactly a Javascript expert.

[MaximSokolov]

How about declaration sub-scope?

.function.declaration {
  .entity.name {
      color: @color1;
  }
}

.function-call, .method-call {
  .entity.name {
      color: @color2;
  }
}

[winstliu]

I think this needs to be updated, because the entire function block shouldn't be tokenized as a prototype.

[winstliu]

@pchaigno A few comments:

1. The names of each have to be updated I think. Maybe just move it to capture 0 of beginCaptures or give it a new name.
2. Can function-params be included in function-body?
3. There's conflicts :(