Better sf support#3164

Merged

thomasp85 merged 3 commits intotidyverse:masterfrom

thomasp85:better-sf

Mar 5, 2019

Commits on Feb 11, 2019

Change sf_grob to work on sfc struct instead of list of sfg
thomasp85
committed

Commits on Feb 25, 2019

Use st_normalize
thomasp85
committed

Commits on Mar 4, 2019

fix single quotes
thomasp85
committed