A META class loader for loading jar files.
interesting the class can load jar classes from different JARs
and from the same jar (if this class is jarred with other jars...
constructor:
decides if the jar filename passed belongs to a jar that:
a) is outside the current class/jar file
b) is inside the JAR file where this class is also stored
A class to retrieve resource no matter where they are: on the file system, in a JAR, in
the currently executing JAR or in a JAR inside the currently executing JAR.