fixed ERRAI-470 - errai-cdi-stress-test is leaking a thread after
undeploy
Merge pull request #33 from pslegr/ERRAI-470_1

fixed ERRAI-470 - errai-cdi-stress-test is leaking a thread after undeploy
minor refactoring: renamed MockTagCloudService to TagCloudService
Introduced WidgetAlreadyBoundException which is thrown in place of the plain RuntimeException now
Merge branch 'master' into 3.0

Conflicts:
	errai-data-binding/src/main/java/org/jboss/errai/databinding/client/BindableProxyAgent.java
	errai-data-binding/src/main/java/org/jboss/errai/databinding/client/api/DataBinder.java