Support related google libraries?

[jdpaterson]

I think it could be nice if this hook also allowed to initialize related libraries like the Drawing Library, and returned a DrawingManager object. Same goes for PlacesService etc...

Any interest in supporting this type of feature? I am happy to have a go at a PR, I am already using similar functionality elsewhere.

[jmarceli]

Hi, Your idea sounds interesting I think that if you will be able to prepare it as a separate hook that should be a useful feature. Feel free to push a PR.