0.0.8 Release

• Now works with Go 1.8 and ETCD 3.1.2 (#46)
• Code now conforms to go fmt (#45)
• Tests now clean up testing prefixes from ETCD (#45)
• Simplifies lookup flow to avoid races (#42)
• Adds race flag to tests (#42)
• Locks ETCD client dependency to 0.46 (#41)
• Adds synchronous update locking (#40)
• Allow unauthenticated update requests (#39)
• Uses consistent keys for new records (#37)