Stalker

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* **Update:** Updated the comment sections of all of the source files to
correctly show that Stalker is LGPL v3 (not v2.1).

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* **New:** Added ``Shot.fps`` attribute to hold the fps information per shot.
* **Update:** Added the necessary alembic revision to reflect the changes in
the ``Version_Inputs`` table.

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* **Fix:** Fixed ``Version_Inputs`` table to correctly take care of
``DELETE``s on the ``Versions`` table. So now it is possible to delete a
``Version`` instance without first cleaning the ``Link`` instances that is
related to that ``Version`` instance.

* **Update:** Changed the ``id`` attribute name from ``info_id`` to ``log_id``
in ``AuthenticationLog`` class.

* **Update:** Started moving towards PostgreSQL only implementation. Merged the
``DatabaseModelTester`` class and ``DatabaseModelsPostgreSQLTester`` class.

* **Fix:** Fixed an autoflush issue in
``stalker.models.review.Review.finalize_review_set()``.

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* **Fix:** Fixed alembic revision

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* **New:** Added ``AuthenticationLog`` class to hold user login/logout info.
* **New:** Added ``stalker.testing`` module to simplify testing setup.

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* **Fix:** Fixed alembic revision.