Simplify object check and eliminate lodash depdency#936

Merged

timdorr merged 4 commits intoreduxjs:masterfrom matthargett:optimize-plain-object-check

May 31, 2018

+241-191

Commits on Apr 24, 2018

Simplify object check and eliminate lodash depdency, mirroring reduxjs/redux#2599 .
matthargett
committed

Commits on Apr 25, 2018