add emacs.d to dotfiles

initialize with packages autocomplete/yasnippet/google-c-style

Signed-off-by: Cristian Stoica <crististm@gmail.com>
update emacs with quicklisp/slime

Signed-off-by: Cristian Stoica <crististm@gmail.com>
update global gitconfig

Signed-off-by: Cristian Stoica <crististm@gmail.com>
use make to install symlinks

Signed-off-by: Cristian Stoica <crististm@gmail.com>