This updates <ros-websocket> to Polymer 3. Polymer 3 uses ES6 modules instead of HTML imports, and it registers and manages dependencies using NPM instead of bower.

If your project uses Polymer 1 or 2, you should continue to use v3 of this element. There are no changes in functionality between this release and the previous.

This release adds support for Polymer 2 as a hybrid element.
This means it can be used in by both Polymer 1.x and Polymer 2 apps.

ros-ros is now known as ros-websocket, which more precisely describes what it does.

Other API changes:

• ros-websocket no longer automatically connects to the websocket URL, unless the auto attribute is set.
• connect() no longer takes a URL argument, but simply uses the value of the url attribute.
• If auto is set, then ros-websocket will try to connect to the websocket URL on startup and whenever the URL changes.