Stalker

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* **Fix:** Added ``Page`` to ``class_names`` in ``db.init()``.

* **Fix:** Fixed ``TimeLog`` tjp representation to use bot the ``start`` and
``end`` date values instead of the ``start`` and ``duration``. This is much
better because it is independent from the timing resolution settings.

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* **Fix:** Fixed ``stalker.models.studio.schedule()`` method, and prevented it
to call ``DBSession.commit()`` which causes errors if there is a transaction
manager.

* **Fix:** Fixed ``stalker.models._parse_csv_file()`` method for empty
computed resources list.

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* **New:** ``stalker.models.task.TimeLog`` instances are now checking if the
dependency relation between the task that receives the time log and the tasks
that the task depends to will be violated in terms of the start and end dates
and raises a ``DependencyViolationError`` if it is the case.

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* **New:** Added ``stalker.models.wiki.Page`` class, for holding a per Project
wiki.

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* **Fix:** ``Review.task`` attribute now accepts None but this is mainly done
to allow its relation to the ``Task`` instance can be broken when it needs to
be deleted without issuing a database commit.

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* **Update:** The following column names are updated:

* ``Tasks._review_number`` to ``Tasks.review_number``
* ``Tasks._schedule_seconds`` to ``Tasks.schedule_seconds``
* ``Tasks._total_logged_seconds`` to ``Tasks.total_logged_seconds``
* ``Reviews._review_number`` to ``Reviews.review_number``
* ``Shots._cut_in`` to ``Shots.cut_in``
* ``Shots._cut_out`` to ``Shots.cut_out``

Also updated alembic migration to create columns with those names.

* **Update:** Updated Alembic revision ``433d9caaafab`` (the one related with
stalker 2.5 update) to also include following updates:

* Create StatusLists for Tasks, Asset, Shot and Sequences and add all the
Statuses in the Task Status Workflow.
* Remove ``NEW`` from all of the status lists of Task, Asset, Shot and
Sequence.
* Update all the ``PREV`` tasks to ``WIP`` to let them use the new Review
Workflow.
* Update the ``Tasks.review_number`` to 0 for all tasks.
* Create StatusLists and Statuses (``NEW``, ``RREV``, ``APP``) for Reviews.
* Remove any other status then defined in the Task Status Workflow from Task,
Asset, Shot and Sequence status list.