Adding support for using a connection string. #2
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I've found that some cloud-based PaaS app hosters (e.g. Heroku) will give you a connection string in your environment variables to use to connect to your psql database, as opposed to explicit username/password variables, in order to be able to easily use this library on apps which are hosted on those sorts of cloud services I've extended the storage to be able to consume either the original connection object, or a connection string.
I've extended the tests to run to tests on both the existing config object method, and the new connection string method.