updated tests and development environment to Vaadin 7.1

 * Example code no uses UI.access() to do "external updates"
 * Built against V7.1.7 by default
 * updated demo app to contain search (already in demo.vaadin.com)
 * updated development versions
 * fixed regressions (due to Vaadin update) in tests

Change-Id: Ie1bdb787cf7fdeef666352c79a1e11b368e64aee