Corrects the usage of word comprehension. Most of the time it should be generator expression
Fixes grammatical and orthographical errors.
Removes particles from IQueryParticlesBubble since it won't help optimization.

Let's analyze the following query::

   these(child
	 for parent in this
	 for child in parent.children
	 if parent.children & (parent.age > 34)
	 if child.age < 6)

Following the order in which particles were create, indeed allows to know
how the programmer layed out his/her query; but by looking at the dependency
of bound-terms in the filters, we can realize that the first filters
is not dependent from the ``child`` token, so we can execute that
filter *before* trying to fetch `children` from `parent`.
Updating copyright notices.
Uses newly introduced `xoutil.decorator.compat.metaclass` to declare metaclasses.

It has a bug with __slots__, but we may live without that for a while.
Fixes index title in documentation.
Fixes doctest. It failed to find `unboxed` and an active bubble.
Makes several modules Py3k and Py2 friendly by using fallbacks in xoutil.
Updates copyright notices in tests.
Hides absolute_import
Pep8s the docstrings in translate.
Fixes the TransitiveRelationDescriptor for translation tests.
Removes the need of python-dateutil for testing translation.

We'll use always YYYY-MM-DD format for dates.
Declarates :func:`xotl.ql.translate.init` as a modulemethod.
Ideas in naive translations for Python VM's memory.
Fixes tests for Py3k compat.
Makes most of our classes Hashable since Py3k requires it. More tests are needed to ensure nothing is broken here.
Includes tox configuration.
Introduces (again I think) dev tag into setup.cfg for devs branches.
Introduces a script for debugging with Pydev.