basic version of login

git-svn-id: svn://localhost/qzcrawler@52 6f648cbf-d750-cb45-8548-4806c1bf26f8
nearly work except cookie error

git-svn-id: svn://localhost/qzcrawler@53 6f648cbf-d750-cb45-8548-4806c1bf26f8
succeed to login

git-svn-id: svn://localhost/qzcrawler@54 6f648cbf-d750-cb45-8548-4806c1bf26f8
use password to login instead of cookies

git-svn-id: svn://localhost/qzcrawler@55 6f648cbf-d750-cb45-8548-4806c1bf26f8
add .gitignore for empty folders
add README
rewrite db.py
rewrite pool.py
rewrite login.py
rewrite config.py
rewrite scratch.py
rewrite analyze.py
add .gitignore
rewrite main.py