Web components and template event handlers

New features

• Server side event handlers for template, e.g.: (click)="$server.myMethod(input.value);"
• Support for HTML imports through Page.addHtmlImport()
• Support for defining dependency imports @StyleSheet, @JavaScript or @HtmlImport
• Support for Polymer DOM operations through Polymer.DOM when Polymer is loaded
• Support for setting inline styles using Element.setAttribute("style","...");
• Attach events have an isInitialAttach method which can be used to react only to the first attach event
• Attach events have an getUI() and getSession() helpers to provide easier access to the UI and Session
• Updated API for all HTML components to use correct default values and return Optional<T> for attributes which are not always present

Fixes

• Template.getParent() returns the parent instead of always throwing an exception
• ThreadLocals are no longer inheritable to avoid referring to the wrong UI in background threads and to prevent memory leaks

Demos

• Hello world using templates update to use server side template event handlers Java HTML
• Integration demo of the Progress Bubble web component Java

New tutorials

• Basic Integration of a Polymer Web Component
• Using Attributes and Properties with a Polymer Web Component
• Using Events with a Polymer Web Component
• Handling User Events in a Template

All changes