Add a new module - mesocore - for core stuff. Add support for settings-based template params like site name.
Start to address #8 by making base template look good-ish.

Navbar and Breadcrumbs are not yet implemented yet - just stubs for now.
Many other pages aren't pretty at all yet.
Too much padding mmmkay.
Mark article contents as safe. Fixes #16
Implement breadcrumbs system and make blog module use it. Fixes #15.