Adjusted naming conventions within the controller.
Merged the data container with the configuration container.
Replaced the Configuration\Container with Configuration.
Modified the argument type for Exception::render
Modified the rendering of exception templates.

Implemented support for two different application specific exception templates.
The first one is defined within the code, i.e.:
`$config->set('exception.template', $path)`

The second one is defined within the application core configuration file with
the index `exception.template`. And, since it's defined within the application
configuration file it is possible to define different exception templates
depending on the application profile and context.
Modified the core code for setting the default exception template.