add "revision" column to wikipedia_works and celery will crawl articles which has larger revision than last max crawled revision
get revision first and use again
pep8
add EOL, delete useless comment, sort imports
Merge pull request #45 from miaekim/celery

Add revision feature to wikipedia_works
add dependency
add index page
remove temporary index page
add User model
add user action (logout)
add social provider support
add docs
make alembic patch
split web test utils
delete wrong test
basical index test
use ReST emphasis
change description
use lowercase
make Credential base class and use foreignkey