Simpler out-of-the-box support for background updates. Now by default Celery uses an SQLite broker, with storage in the `.wiki` directory. This makes it possible to support async updates by simply passing `--usetasks` to `wk runserver`, while also running `wk runtasks` in a different process.

Flask==0.10.1
Flask-Bcrypt==0.5.2
Flask-Login==0.2.10
Flask-Script==0.5.1
Jinja2==2.7.2
Markdown==2.2.1
Pygments==1.6
SQLAlchemy==0.9.3
Whoosh==2.5.5
colorama==0.2.7
py-bcrypt==0.4
pysqlite==2.6.3
pytest==2.5.2
repoze.lru==0.6
python-hglib