Textastic Commit

Created Section model, updated Article model with slug field and
support for comments and sections.

Created URL patterns for project and new articles.

Started work on new article views (starting with section-specific
views).

Created comments app, comment model with support for replying to other
comments via ForeignKey, attaching individual Comment rows to specific
Article rows (again, with ForeignKey).

All changes were handmade and are UNTESTED.