Upgrade ScalaTest and scala-maven-plugin
[inmethod-grid] Fixes #333 - Reintroduce SizeUnit#PERCENT
async-tasks-impl: Adding refreshBehavior in ProgressButton ctor if task container already running

(cherry picked from commit 7db6241f8d09be99aeb5cb723e3736b155a10a24)
Merge branch 'wicket-6.x' of https://github.com/wicketstuff/core into wicket-6.x