Refactor extension discovery
Refactor extension discovery

matthiask/django-content-editor,michaelkuty/feincms,nickburlett/feincms,mjl/feincms,nickburlett/feincms,feincms/feincms,joshuajonah/feincms,joshuajonah/feincms,joshuajonah/feincms,michaelkuty/feincms,matthiask/feincms2-content,nickburlett/feincms,matthiask/django-content-editor,nickburlett/feincms,michaelkuty/feincms,joshuajonah/feincms,michaelkuty/feincms,matthiask/django-content-editor,feincms/feincms,matthiask/feincms2-content,mjl/feincms,matthiask/feincms2-content,feincms/feincms,mjl/feincms,matthiask/django-content-editor