[MRESOURCES-182] Example Custom resource filters incorrect

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1618969 13f79535-47bb-0310-9956-ffa450edef68
[MCHECKSTYLE-70] Support for multiple source folders
Forgot to add matching IT

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1618970 13f79535-47bb-0310-9956-ffa450edef68