Compiles a combined widgetset of all Vaadin widgetsets found on the classpath.
Updating ${widgetset}...
Remember to define the widgetset in web.xml as follows.
<init-param>
<param-name>widgetset</param-name>
<param-value>${widgetset}</param-value>
</init-param>
Compiling ${widgetset} into ${client-side-destination} directory...