Use a vendor directory for repeatable builds - fixes #816

This is using godep to manage the vendor directory.

vendor/github.com/skratchdot/open-golang/LICENSE-MIT

@@ -0,0 +1,22 @@
+Copyright (c) 2013 skratchdot
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/skratchdot/open-golang/open/exec.go

@@ -0,0 +1,18 @@
+// +build !windows,!darwin
+
+package open
+
+import (
+	"os/exec"
+)
+
+// http://sources.debian.net/src/xdg-utils/1.1.0~rc1%2Bgit20111210-7.1/scripts/xdg-open/
+// http://sources.debian.net/src/xdg-utils/1.1.0~rc1%2Bgit20111210-7.1/scripts/xdg-mime/
+
+func open(input string) *exec.Cmd {
+	return exec.Command("xdg-open", input)
+}
+
+func openWith(input string, appName string) *exec.Cmd {
+	return exec.Command(appName, input)
+}

vendor/github.com/skratchdot/open-golang/open/exec_darwin.go

@@ -0,0 +1,15 @@
+// +build darwin
+
+package open
+
+import (
+	"os/exec"
+)
+
+func open(input string) *exec.Cmd {
+	return exec.Command("open", input)
+}
+
+func openWith(input string, appName string) *exec.Cmd {
+	return exec.Command("open", "-a", appName, input)
+}

vendor/github.com/skratchdot/open-golang/open/exec_windows.go

@@ -0,0 +1,28 @@
+// +build windows
+
+package open
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+var (
+	cmd      = "url.dll,FileProtocolHandler"
+	runDll32 = filepath.Join(os.Getenv("SYSTEMROOT"), "System32", "rundll32.exe")
+)
+
+func cleaninput(input string) string {
+	r := strings.NewReplacer("&", "^&")
+	return r.Replace(input)
+}
+
+func open(input string) *exec.Cmd {
+	return exec.Command(runDll32, cmd, input)
+}
+
+func openWith(input string, appName string) *exec.Cmd {
+	return exec.Command("cmd", "/C", "start", "", appName, cleaninput(input))
+}

vendor/github.com/skratchdot/open-golang/open/open.go

@@ -0,0 +1,50 @@
+/*
+
+	Open a file, directory, or URI using the OS's default
+	application for that object type.  Optionally, you can
+	specify an application to use.
+
+	This is a proxy for the following commands:
+
+	         OSX: "open"
+	     Windows: "start"
+	 Linux/Other: "xdg-open"
+
+	This is a golang port of the node.js module: https://github.com/pwnall/node-open
+
+*/
+package open
+
+/*
+	Open a file, directory, or URI using the OS's default
+	application for that object type. Wait for the open
+	command to complete.
+*/
+func Run(input string) error {
+	return open(input).Run()
+}
+
+/*
+	Open a file, directory, or URI using the OS's default
+	application for that object type. Don't wait for the
+	open command to complete.
+*/
+func Start(input string) error {
+	return open(input).Start()
+}
+
+/*
+	Open a file, directory, or URI using the specified application.
+	Wait for the open command to complete.
+*/
+func RunWith(input string, appName string) error {
+	return openWith(input, appName).Run()
+}
+
+/*
+	Open a file, directory, or URI using the specified application.
+	Don't wait for the open command to complete.
+*/
+func StartWith(input string, appName string) error {
+	return openWith(input, appName).Start()
+}