Moved invewrapper in an homonymous package, otherwise package_data won't work

and data_files doesn't leave the files in an easy to access location relative to the module ( different python implementations have site-packages ina different location )
also, when packaged, inve loses its executable bit, thus now I'll explicitly call the python interpreter even on *nix
bumped the version to 0.1.2, for pypi to accept the package (this is the first package that actually works: I wasn't sure how to test locally, and I believed that if it worked with "setup.py install", it would've worked from the sdist package)