Suggestion: use syntax iskeyword against set iskeyword

In the file `/autoload/syntax/angular.html.vim` there is:
```vimL
setlocal iskeyword+=-
```
But this will  change how motion `w` works on the symbol `-`.

I think `syntax iskeyword @,48-57,_,192-255,$,-` is better.

As vim document said, 

    This defines the keyword characters.  It's like the `iskeyword` for but only applies to syntax highlighting.
