.emacs_d/lisp/bhj-grep.el: fix the grep tag for android resource xml files
bin/git-interactive-add: allow to discard changes
bin/git-push-mac: sort the commit msgs but keep the order how they are added
bin/sort-commit-msgs: add a script to sort commit msgs

Signed-off-by: Bao Haojun <baohaojun@gmail.com>