* Added support for configurable user-supplied `Jinja
`_ HTML templates for the notebook. Paths to
directories containing template files can be specified via
``NotebookApp.extra_template_paths``. User-supplied template directories
searched first by the notebook, making it possible to replace existing
templates with your own files.
For example, to replace the notebook's built-in ``error.html`` with your own,
create a directory like ``/home/my_templates`` and put your override template
at ``/home/my_templates/error.html``. To start the notebook with your custom
error page enabled, you would run::
ipython notebook '--extra_template_paths=["/home/my_templates/"]'
It's also possible to override a template while also `inheriting
`_ from that
template, by prepending ``templates/`` to the ``{% extends %}`` target of
your child template. This is useful when you only want to override a
specific block of a template. For example, to add additional CSS to the
built-in ``error.html``, you might create an override that looks like::
{% extends "templates/error.html" %}
{% block stylesheet %}
{{super()}}
{% endblock %}