Merge pull request #46 from bcwaldon/agent-prefix

refactor(unit): Use a unit_prefix cfg opt to control systemd naming
chore(logging): Add more logging to conflict detection code
bump(github.com/codegangsta/cli): 1cb22918943809d24db50319ca479ba9f60984b5
bump(github.com/coreos/etcd/error):
bump(github.com/coreos/etcd/store):
bump(github.com/coreos/go-etcd): 02b17cc6b9e17d2442497b31a8ef560493b6b17d
bump(github.com/nu7hatch/gouuid): 179d4d0c4d8d407a32af483c2354df1d2c91e6c3