Fix: nullpointer error with absolute_path
Fix: extra nullpointer checks in C++
Java is called from JS

This seems to be a stable version. The Custom java class (Mongomanager)
can be called from JS, but NO MongoDriver is embadded (with the driver
it does not work)
Change: gitignore for the SConstruct file
Ignore does not work

I want to sync, so i commit my SConstruct