Imports of package backend

PathSynopsis
bytesPackage bytes implements functions for the manipulation of byte slices.
github.com/coreos/etcd/Godeps/_workspace/src/github.com/boltdb/boltPackage bolt implements a low-level key/value store in pure Go.
ioPackage io provides basic interfaces to I/O primitives.
logPackage log implements a simple logging package.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.
timePackage time provides functionality for measuring and displaying time.