Fix #46, add configuration for Travis CI
Fix #32, add flake8 in Travis CI configuration for checking coding style
Fix #32, clean pep8 coding style issues
Add testing coverage minimum percentage check
Add use-mirrors flag for installing flake8 in .tarvis.yml
Try run tests against postgresql on travis ci
Add missing psycopg2 installation
Merge pull request #47 from victorlin/setup-travis-ci

Fix #46, add configuration for Travis CI
Fix #45, add limitation to transaction failure times
Read maximum_retry from configuration file
Merge pull request #48 from victorlin/limit-transaction-failure-times

Limit transaction failure times