Basic Stubs for Core Files

- `.emacs`: Loads emacs-core.el, and delimits a place for local
  customizations.
- `emacs-core.el`: Intended for being a sort of configuration file for
  the setup. Loads the files that actually perform customizations.

I'm copying over from a private repo piece by piece here (refactoring in
the process), so there is a purpose to these early changes!