Resurrect dev tag in development branch.
Better readme.
Fix other builder's metadata in docs.
Prefer default command given by arguments.

Arguments should take over other global configurations.  This allow to
have several scripts that have different defaults.
Include "exec_" and "execfile_" compatibility.
Truly minor change.
Allow a command to specify it's own name.
Add a `strict` parameter to `smart_getter`.
Add a `get_traverser` method.
Update history.
Minor change.
Merge branch 'develop' of localhost:xoutil into develop
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.