Use database.yml configuration tweak instead of postgres.conf
Update README.textile

Use database.yml configuration tweak instead of postgres.conf when ActiveRecord ORM
Merge branch 'master' of github.com:21croissants/database_cleaner into 21croissants-master

Conflicts:
	README.textile
Added pull request #151 by @21croissants.
Merge branch '21croissants-master'

https://github.com/DatabaseCleaner/database_cleaner/pull/151