log-level incorrect

[micahlmartin]

The docs still show setting the log level as DEBUG INFO WARN and ERROR. Trying to set it this way results in an error when launching. The commands should either be lower cased or the docs updated. Also, trying to launch the container without specifying a proper log-level also results in a warning when starting because it defaults to DEBUG.

https://github.com/Sirupsen/logrus/blob/418b41d23a1bf978c06faea5313ba194650ac088/logrus.go#L15-L31

[ChrisAubuchon]

That's what I get for changing logging packages. Commit 8648351 should fix this