Add C'Tors taking Throwable to ResourceNotFoundException. Clean up the
resource loaders using this (actually only one generates RNFE from another
exception but this is a good excuse to add some StringUtils sprinkling to 
String tests...

git-svn-id: https://svn.apache.org/repos/asf/jakarta/velocity/engine/trunk@471259 13f79535-47bb-0310-9956-ffa450edef68
8 files changed