uPortal 5.1.1

This is a patch release (maintenance update) for uPortal 5.1. It includes a several fixes and improvements.

Change Log

• Important fix for a regression introduced with version 5.1.0 where several admin portlets would return HTTP 405 at various points
• Improvements to the CODE_OF_CONDUCT docs
• Add several missing @Override annotations throughout the codebase
• Update the Spring Framework version to 4.3.17
• Update to Node.js version 10 and npm version 5
• Update the org.json:json dependency to version 20180130
• Updates to the code style documentation
• Update several documentation links
• Update several Gradle plugins to newer versions

There is additional detail in the JIRA Release Notes.

This update should be safe to apply to any uPortal 5.1.x implementation.

Thanks to everyone who contributed!