move logging to log, utils.go contains a debug logging function.

Docker-DCO-1.1-Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Merge pull request #26 from erikh/glog-to-log

move logging to log, utils.go contains a debug logging function.
Update close to not block on shutdown

Closes #24

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)