v1.4.2

• GH-573 Persist now uses the correct key for deserialization
• GH-619 "null" values and "Date" values causes errors.
• GH-612 MultiChart Persist Issues
• SVG Surface Button Issue
• Google Map Missing Test Data
• GH-537 AM Chart Click Events
• GH-587 Form enter should submit
• GH-607 Grid designMode now displays grid-drop-target
• GH-590 Form Default Value
• Fix ESP Response
• GH-599 Surface Button Fix (click event)