Use common generics from generics package

[vspinu]

There is now generics package which defines a bunch of common generics like union and intersect.

Currently, if a package imports both raster and a package which uses generics warnings like these are generated.

All one has to do is to import and re-export a generic like in this example

[rhijmans]

I would consider that if many more tidyverse methods were in there; that would be very helpful.