Reformat /pom.xml after bf118fbf67ab4d8f39aba57ddca746390eb07b8a
Fix outdated javadoc for PropertyValidator#requiredFlagSet member field
Minor non-functional improvements

Remove useless "@see parent" javadoc
Simplify String concatenation
Java 7 diamonds
Fix javadoc link
Java 7 diamonds
Simplify by using "switch (String)"
WICKET-5698 WebApplication#unmount() unmounts the whole compound mapper if some of its inner ones matches
WICKET-5350 remove wildcards from #ofList() and others
WICKET-5350 adjust components' wildcards
Git ignore testing/wicket-js-tests/node/ folder
WICKET-5692: improved Unresolvable Property Message