v2.0.0-beta.18

• feat(populate): childAlias for store results of populate on another parameter - #126
• feat(profile): Firestore support for updateProfile method - issue 25 on redux-firestore
• feat(storage): progress option added to uploadFile method - #346
• feat(storage): uploadFile default metadata written to DB now includes createdAt
• feat(core): redux-firestore is no longer a dependency - managed by library user directly
• fix(examples): Material-ui example updates (including moving injectTapEventPlugin() to main.js)