* release/0.1.0:
define required environment variables for docs build
set version number, add changelog entry
add missing quotes to encoding
create databases with UTF8 encoding
avoid transaction for CREATE and DROP database
add missing assignment
add identifier quoting
implement pgsqltasks
add Celery application and settings
add unimplemented pgsqltasks
initial documentation and requirements
unify routers, add support for mysql and pgsql tasks
initial version