Cosmetic changes to README.org
Add information about magit to README.org
Use add-to-list to add directories to load-path

Previously normal-top-level-add-to-load-path was used -- an
unnecessarily complex solution.
Don't ignore all initialization warnings

The previous code ignored all warnings of type "initialization" because
I didn't want to see the one about .emacs.d being in load-path. The code
in this commit ignores only this one warning.