Improvements made in prepare to packaging u2py

+ Added LICENSE.txt, MANIFEST.in, README.txt, setup.py
 (previous setup renamed to setup_py2exe.py) - necessary
 parts for packaging.
+ u2py.config and webapi.config got relative path changes
  to make them work in packaged state.
+ u2py.interface_basis and webapi.handlers_base now properly use logging
  instead of u2py.config.logging