Add explicit entry points for node, browser and react_native, allowing imports like 

import optimizelySdk from '@optimizely/optimizely-sdk/node'

import optimizelySdk from '@optimizely/optimizely-sdk/browser'

import optimizelySdk from '@optimizely/optimizely-sdk/react_native'

Log an error in DatafileManager when datafile fetch fails (

Javascript-SDK - 5.2.0

Javascript-SDK - 5.1.0


Data set that refers to a person or a role and contains at least one address via which the person or role can receive messages.