[NPANDAY-578] rename AssemblyFoldersEx option

Reference assemblies appears ambiguous now that the framework may find assemblies there,
therefore changing the name to Extra Assembly Folders.


git-svn-id: https://svn.apache.org/repos/asf/incubator/npanday/trunk@1452311 13f79535-47bb-0310-9956-ffa450edef68