Reverting "Add active manager for non-removed ``Applications``."
Add active manager for non-removed ``Applications``.

The manager will return every ``Application`` that hasn't
been removed.

This is a safe-guard used by the front-end views.
Add link the ``Application`` in listing include.

The listing includes a link to the detail of the application.
Add detail page for the ``Application``.

https://github.com/madewithbytes/us_ignite/issues/65

The ``Application`` detail page uses an unique ``slug``.

The visibility of the ``Application`` is determined by a ``status``
or membership on it.

Closes #65.
Increase user ``Profile`` slug details.

The slug in the user profile accept ``-`` as well.