init.el: define copy-multiple-lines(like kill-whole-line) function to replace default copy-line binding to F6, now you can copy multiple lines without even marking them
init.el: delete F5/F6(copy-multiple-lines/kill-whole-line) with whole-line-or-region package, use default C/M-w to do all the work
init.el: add guide-key, helm-descbinds packages, bind whitespace-mode to `C-c w`
elpa: add guide-key, helm-descbinds packages and updates
snippets: add two new snippets for emacs-lisp-mode