2017.11.1, Mass Gift

• support for sending basic Firebase Cloud Messaging push notifications
• fixed HTTP 500 on FCM token reinsert attempt
• watching gateways for disconnections (push notifications)
• avoid loosing sensor data in batch on DB exception
• support for OAuth via access-token (Facebook)
• support for custom enum data types
• GW Server replies to WS ping
• introduced GWS tests
• XML-UI returns also last sensor data
• timezones defined via offset are handled in a more generic way
• session language can be overriden from HTTP request
• partial fix of handling locales per users
• fixed matching of VPT zones
• logging duration of certain high-level operations
• small refactoring of transactions
• rework of pairing/unpairing without work-framework
• work-framework dropped