Add ``markdown`` as part of the requirements.
Add method to generate and sanitize markdown text.

The markdown module is used to generate the HTML and then
the ``sanitize`` bleach mechanics to remove any malicious
HTML.
Remove any HTML tag from ``Application`` markdown fields.

The fields capable of displaying markdown are:
 - ``description``
 - ``team_description``
 - ``roadmap``

These fields are striped of any HTML.
Add template tag to render ``markdown``.
Render ``Application`` markdown fields.
Add Mozilla Ignite importer mechanics.

The importer reads from an specific JSON file generated
in the Mozilla Ignite site.

Imports all the data and associates it to owners.