Merge pull request #28 from creichert/postgres

Rename config/keter.yaml to config/keter.yml for consistency.
Turn on rtsopts (and -N by default)
Workaround for yesodweb/yesod#814
persistent 2.0
Comment environment variables
New keter config file format
Rename tests to test (more consistent with the rest of the Yesod world)
Explicit record syntax
Yesod 1.4
Upgrade bootstrap from 2.3.2 to 3.2.0.