etcdlockclient: return err for Set operation
Merge pull request #27 from jonboulle/master

fix updateengine.RebootNeededSignal and add tests
version: bump to v0.1.6
Merge pull request #25 from unihorn/set-err

etcdlockclient: return err for Set operation
version: bump to 0.1.6+git
lock: remove useless todo
Merge pull request #28 from philips/remove-useless-todo

lock: remove useless todo