Add syntax highlighting for Closure Compiler annotations

Hi, this pull request adds the syntax highlighting for the [Google Closure Compiler annotations](https://developers.google.com/closure/compiler/docs/js-for-compiler#tags) that jsDoc does **NOT YET** recognize. 

There's already [an issue](https://github.com/jsdoc3/jsdoc/issues/605) posted by jsDoc's main maintainer and this issue is being included in jsDoc's next milestone. Therefore, these tags are highly likely to be implemented in the future as the standard ones.