- Update to version 0.8:
  * Refactored session support into a session interface so that
    the implementation of the sessions can be changed without
    having to override the Flask class.
  * Empty session cookies are now deleted properly automatically.
  * View functions can now opt out of getting the automatic
    OPTIONS implementation.
  * HTTP exceptions and Bad Request errors can now be trapped so that they
    show up normally in the traceback.
  * Flask in debug mode is now detecting some common problems and tries to
    warn you about them.
  * Flask in debug mode will now complain with an assertion error if a view
    was attached after the first request was handled.  This gives earlier
    feedback when users forget to import view code ahead of time.
  * Added the ability to register callbacks that are only triggered once at
    the beginning of the first request. (:meth:`Flask.before_first_request`)
  * Malformed JSON data will now trigger a bad request HTTP exception instead
    of a value error which usually would result in a 500 internal server
    error if not handled.  This is a backwards incompatible change.
  * Applications now not only have a root path where the resources and modules
    are located but also an instane path which is the designated place to
    drop files that are modified at runtime (uploads etc.).  Also this is
    conceptionally only instance depending and outside version control so it's
    the perfect place to put configuration files etc.  For more information
    see :ref:`instance-folders`.
  * Added the ``APPLICATION_ROOT`` configuration variable.
  * Implemented :meth:`~flask.testing.TestClient.session_transaction` to
    easily modify sessions from the test environment.
  * Refactored test client internally.  The ``APPLICATION_ROOT`` configuration
    variable as well as ``SERVER_NAME`` are now properly used by the test client

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