Version 0.2.11-beta-release

Updates introduced since 0.2.10-beta-release

• 4bb90f1 Upgrade frontend and backend dependencies - (NI) 4AC3E3D5FDD208F7 U
• 1d05a91 Change my public email address - (NI) 4AC3E3D5FDD208F7 U
• b87d543 Send OPTIONS request to the WebSockets interface once per Timeout interval. This allows some deployment environment to correctly detect the status of the application - (NI) 4AC3E3D5FDD208F7 U