Emencia-django-forum

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* Changed last thread link on Category index to go to the last thread post;

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* Added some css to stylize ``<pre>`` and ``code`` in post messages;
* Added new setting ``FORUM_DEFAULT_THREADWATCH_CHECKBOX`` for default value for thread watch input in post form;
* Don't hide object owner in django admin anymore, close 12;

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* Fix bad name with moderation permissions for Category and Thread models;

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* Totally removing ``django-guardian`` usage and dependancy. Reasons are:

* Add a new layer for managing permissions that is difficult to maintain;
* guardian does not play nice with global permissions and groups, we have to add more code to manage it well;
* Per-object permissions was a little bit out of the scope of this forum app because it's not a community oriented forum;

* Cleaning documentation from ``django-guardian`` occurences;

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* Last try for fixing django-guardian before removing it;
* Fix base template title;

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* Fix forgotten typo in parser config name;