Stalker

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* **Update:** Fixed a little bug in Link.extension property setter.

* **New:** Moved the stalker.models.env.EnvironmentBase class to
"Anima Tools" python module.

* **Fix:** Fixed a bug in stalker.models.task.Task._responsible_getter() where
it was always returning the greatest parents responsible as the responsible
for the child task when the responsible is set to None for the child.

* **New:** Added ``stalker.models.version.Version.naming_parents`` which
returns a list of parents starting from the closest parent Asset, Shot or
Sequence.

* **New:** ``stalker.models.version.Version.nice_name`` now generates a name
starting from the closest Asset, Shot or Sequence parent.

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* **New:** ``Ticket`` action methods (``resolve``, ``accept``, ``reassign``,
``reopen``) now return the created ``TicketLog`` instance.

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* **Update:** Added tests for negative or zero fps value in Project class.

* **Fix:** Minor fix to ``schedule_timing`` argument in Task class, where IDEs
where assuming that the value passed to the ``schedule_timing`` should be
integer where as it accepts floats also.

* **Update:** Removed ``bg_color`` and ``fg_color`` attributes (and columns)
from Status class. Use SimpleEntity.html_class and SimpleEntity.html_style
attributes instead.

* **New:** Added ``Project.open_tickets`` property.

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* **Fix:** Fixed an inconvenience in SimpleEntity.__init__() when a
date_created argument with a value is later than datetime.datetime.now() is
supplied and the date_updated argument is skipped or given as None, then the
date_updated attribute value was generated from datetime.datetime.now() this
was causing an unnecessary ValueError. This is fixed by directly copying the
date_created value to date_updated value when it is skipped or None.

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* **New:** SimpleEntity now have two new attributes called ``html_style`` and
``html_class`` which can be used in storing cosmetic html values.

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* **Update:** Note.content attribute is now a synonym of the Note.description
attribute.