Modifications added to allow JBoss users to store their roller-custom.properties file *outside* of the WAR following: https://community.jboss.org/wiki/HowToPutAnExternalFileInTheClasspath

git-svn-id: https://svn.apache.org/repos/asf/roller/trunk@1506984 13f79535-47bb-0310-9956-ffa450edef68