Preparing publication of the release 2.0.7. For this, we have new release of the bob bob.io.video, bob.learn.em and bob.core

Removed the get_versions.py script as an entry point. For some reason this is messing up with the macports build

Reordered the requirement list

Changed the file bootstrap.py to bootstrap-buildout.py

Checked the existence of pkgtools in the environment