fixed CS
Allowed shared ContextListener for firewalls
feature #964 Allowed shared ContextListener for firewalls (ibrasho)

This PR was squashed before being merged into the 2.0.x-dev branch (closes #964).

Discussion
----------

Allowed shared ContextListener for firewalls

In response to #963.

Checks for a `context` key in the firewall configuration, if it's not there use `name`.

Commits
-------

a56d0fa Allowed shared ContextListener for firewalls