Stalker

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* Updated homepage information.

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* Stalker Pyramid is now using MIT License.
* Removed the bloat created by the license text on nearly every source file.

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Stalker Changes
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* Fixed a bug in ``Task.responsible`` attribute. This change has also slightly
changed how the ``Task.responsible`` attribute works. It still comes from the
parent if the ``Task.responsible`` is empty or None, but when queried it
causes the attribute to be filled with parent data. This is a slight change,
but may break some workflows.

* Added ``ScheduleMixin.to_unit`` that converts the given ``seconds`` to the
given ``unit`` in consideration of the given ``schedule_model``.

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* ``Task.percent_complete`` value is now properly calculated for a parent Task
that contains a mixed type of "effort", "duration" and "length" based tasks.

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* **Update:** Updated the ``.travis.yml`` file to use PostgreSQL 13.3 and
Ubuntu 20.04 Focal Fossa.
* **Update:** Updated the ``upload_to_pypi`` command to follow the current
Python packaging guide.
* **Update:** Migrated from ``TravisCI.org`` to ``TravisCI.com``.
* **Update:** Re-enabled concurrent testing in ``.travis.yml``.

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* **Update:** Stalker is now compatible with SQLAlchemy 1.4,
psycopg2-binary 2.86 and Python 3.9+. But more work still needs to be done to
make it SQLAlchemy 2.0 compatible.