Fix el-get path.
Put Emacs customization into init.el.

Emacs' customize puts changes into init.el, regardless where it was
loaded.  Consequently, init-custom-faces.el and
init-custom-variables.el do not work as intended.  Moved the
customizations back to init.el and removed the superfluous files.
Add org-mode submodule.
Add python-mode customizations.
Remove unnecessary submodules.

org-mode is now installed via el-get.
Remove unnecessary elisp modules provided by el-get.
Reorder initialization so customize doesn't break.
Perform Python autocompletion with jedi.