Added extra path to find_jar() to ensure jar file found

I installed py4j using easy_install-2.7 on Ubuntu 12.04.
 
The jar file ended up in /usr/local/lib/python2.7/dist-packages/py4j-0.8-py2.7.egg/share/py4j/py4j0.8.jar , which wasn't included in any of the list of paths in find_jar(). The attached patch fixes this for me.