Fix module name and copyright note for `uuid.py'.
Merge branch 'develop' of /media/med/merchise-git/xoutil into develop
Minor changes.
Add a `peek` method to StackedLevel dict.
Configure tox to test py2.7 and py3.1+
Fix reprlib for python 3.1 compatibility.
Fix classical AOP for python 3.1 compatibility.
Note that `metaclass` works rarely in py3.1 or less.
Fix collection tests.