Switch to using the dep tool and update all the dependencies

vendor/golang.org/x/text/cmd/gotext/doc.go

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+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// DO NOT EDIT THIS FILE. GENERATED BY go generate.
+// Edit the documentation in other files and rerun go generate to generate this one.
+
+// gotext is a tool for managing text in Go source code.
+//
+// Usage:
+//
+// 	gotext command [arguments]
+//
+// The commands are:
+//
+// 	extract     extract strings to be translated from code
+//
+// Use "go help [command]" for more information about a command.
+//
+// Additional help topics:
+//
+//
+// Use "gotext help [topic]" for more information about that topic.
+//
+//
+// Extract strings to be translated from code
+//
+// Usage:
+//
+// 	go extract <package>*
+//
+//
+//
+//
+package main