Update the vendor folder (#53)

* Update the vendor folder

* Update the Gopkg.lock by running dep ensure

vendor/github.com/vbatts/tar-split/cmd/tar-split/README.md

@@ -0,0 +1,39 @@
+# tar-split utility
+
+## Installation
+
+	go get -u github.com/vbatts/tar-split/cmd/tar-split
+
+## Usage
+
+### Disassembly
+
+```bash
+$ sha256sum archive.tar 
+d734a748db93ec873392470510b8a1c88929abd8fae2540dc43d5b26f7537868  archive.tar
+$ mkdir ./x
+$ tar-split disasm --output tar-data.json.gz ./archive.tar | tar -C ./x -x
+time="2015-07-20T15:45:04-04:00" level=info msg="created tar-data.json.gz from ./archive.tar (read 204800 bytes)"
+```
+
+### Assembly
+
+```bash
+$ tar-split asm --output new.tar --input ./tar-data.json.gz  --path ./x/
+INFO[0000] created new.tar from ./x/ and ./tar-data.json.gz (wrote 204800 bytes)
+$ sha256sum new.tar 
+d734a748db93ec873392470510b8a1c88929abd8fae2540dc43d5b26f7537868  new.tar
+```
+
+### Estimating metadata size
+
+```bash
+$ tar-split checksize ./archive.tar
+inspecting "./archive.tar" (size 200k)
+ -- number of files: 28
+ -- size of metadata uncompressed: 28k
+ -- size of gzip compressed metadata: 1k
+```
+
+
+