B: Increment directory depth count before calling onDirEnter handler.
B: Do not try to walk /bin directory, as this may not work on Non-Unix systems.
M: Added currentDepth() method.

The getDepth() method will return the default (or user-specified) directory traversel depth. Calling the setDepth method with a negative value will make the method die.
M: Renamed filesInDir() to count().
M: Added entryList() method.