bump file-server inigo nsync

Submodule src/github.com/cloudfoundry-incubator/file-server e432c8a..5b8dbac:
  > move main binary under cmd/file-server
Submodule src/github.com/cloudfoundry-incubator/inigo afb5bd3..4bdf9d8:
  > update nsync and file-server executable names
Submodule src/github.com/cloudfoundry-incubator/nsync c9c3d04..bb8e24f:
  > reorganize repo