@EventData for Polymer events and query string support

New features

• @EventData can be used on PolymerTemplate @EventHandler method parameters to collect data from the client-side event.
• Query string parameters can now be used for navigation.
  • Parameters are available in various events
  • The query string is preserved when handling history events
  • Can give query string parameters as input to various navigation methods

Fixes

• Picked fixes from Framework v7 and v8

Demos

• No relevant demo changes

Tutorials

• Angular template tutorials have been moved to the side and marked as deprecated.

All changes

https://github.com/vaadin/hummingbird/milestone/22?closed=1