Add magit, and bind to C-x m
Add sort-symbols and sort-symbols-in-sexp

These are particularly useful for sorting the package list in
packages.el.
Use smartparens C-M-a and C-M-e in paredit

These default to beginning-of-defun and end-of-defun. They were already
rebound for smartparens-enabled modes; this commit rebinds them for
paredit-enabled modes as well.