Use a vendor directory for repeatable builds - fixes #816

This is using godep to manage the vendor directory.

vendor/github.com/stacktic/dropbox/README.md

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+dropbox
+=======
+Go client library for the Dropbox core and Datastore API with support for uploading and downloading encrypted files.
+
+Support of the Datastore API should be considered as a beta version.
+
+Prerequisite
+------------
+To use this library, you must have a valid client ID (app key) and client secret (app secret) provided by Dropbox.<br>
+To register a new client application, please visit https://www.dropbox.com/developers/apps/create
+
+Installation
+------------
+This library depends on the oauth2 package, it can be installed with the go get command:
+
+    $ go get golang.org/x/oauth2
+
+This package can be installed with the go get command:
+
+    $ go get github.com/stacktic/dropbox
+
+
+Examples
+--------
+This simple 4-step example will show you how to create a folder:
+
+    package main
+
+    import (
+        "dropbox"
+        "fmt"
+    )
+
+    func main() {
+        var err error
+        var db *dropbox.Dropbox
+
+        var clientid, clientsecret string
+        var token string
+
+        clientid = "xxxxx"
+        clientsecret = "yyyyy"
+        token = "zzzz"
+
+        // 1. Create a new dropbox object.
+        db = dropbox.NewDropbox()
+
+        // 2. Provide your clientid and clientsecret (see prerequisite).
+        db.SetAppInfo(clientid, clientsecret)
+
+        // 3. Provide the user token.
+        db.SetAccessToken(token)
+
+        // 4. Send your commands.
+        // In this example, you will create a new folder named "demo".
+        folder := "demo"
+        if _, err = db.CreateFolder(folder); err != nil {
+            fmt.Printf("Error creating folder %s: %s\n", folder, err)
+        } else {
+            fmt.Printf("Folder %s successfully created\n", folder)
+        }
+    }
+
+If you do not know the user token, you can replace step 3 by a call to the Auth method:
+
+        // This method will ask the user to visit an URL and paste the generated code.
+        if err = db.Auth(); err != nil {
+            fmt.Println(err)
+            return
+        }
+        // You can now retrieve the token if you want.
+        token = db.AccessToken()
+
+If you want a more complete example, please check the following project: https://github.com/stacktic/dbox.
+
+Documentation
+-------------
+
+API documentation can be found here: http://godoc.org/github.com/stacktic/dropbox.