Switch to github.com/golang/dep for vendoring

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

vendor/github.com/containers/storage/docs/oci-storage-applydiff.md

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+## oci-storage-apply-diff 1 "August 2016"
+
+## NAME
+oci-storage apply-diff - Apply a layer diff to a layer
+
+## SYNOPSIS
+**oci-storage** **apply-diff** [*options* [...]] *layerNameOrID* [*referenceLayerNameOrID*]
+
+## DESCRIPTION
+When a layer is first created, it contains no changes relative to its parent
+layer.  The layer can either be mounted read-write and its contents modified
+directly, or contents can be added (or removed) by applying a layer diff.  A
+layer diff takes the form of a (possibly compressed) tar archive with
+additional information present in its headers, and can be produced by running
+*oci-storage diff* or an equivalent.
+
+Layer diffs are not typically applied manually.  More often they are applied by
+a tool which is being used to import an entire image, such as **skopeo**.
+
+## OPTIONS
+**-f | --file** *filename*
+
+Specifies the name of a file from which the diff should be read.  If this
+option is not used, the diff is read from standard input.
+
+## EXAMPLE
+**oci-storage apply-diff -f 71841c97e320d6cde.tar.gz layer1**
+
+## SEE ALSO
+oci-storage-changes(1)
+oci-storage-diff(1)
+oci-storage-diffsize(1)