Migrate to dep (#3972)

* Update makefile to use dep

* Migrate to dep

* Fix some deps

* Try to find a better version for golang.org/x/net

* Try to find a better version for golang.org/x/oauth2

vendor/github.com/facebookgo/clock/README.md

@@ -1,104 +0,0 @@
-clock [![Build Status](https://drone.io/github.com/benbjohnson/clock/status.png)](https://drone.io/github.com/benbjohnson/clock/latest) [![Coverage Status](https://coveralls.io/repos/benbjohnson/clock/badge.png?branch=master)](https://coveralls.io/r/benbjohnson/clock?branch=master) [![GoDoc](https://godoc.org/github.com/benbjohnson/clock?status.png)](https://godoc.org/github.com/benbjohnson/clock) ![Project status](http://img.shields.io/status/experimental.png?color=red)
-=====
-
-Clock is a small library for mocking time in Go. It provides an interface
-around the standard library's [`time`][time] package so that the application
-can use the realtime clock while tests can use the mock clock.
-
-[time]: http://golang.org/pkg/time/
-
-
-## Usage
-
-### Realtime Clock
-
-Your application can maintain a `Clock` variable that will allow realtime and
-mock clocks to be interchangable. For example, if you had an `Application` type:
-
-```go
-import "github.com/benbjohnson/clock"
-
-type Application struct {
-	Clock clock.Clock
-}
-```
-
-You could initialize it to use the realtime clock like this:
-
-```go
-var app Application
-app.Clock = clock.New()
-...
-```
-
-Then all timers and time-related functionality should be performed from the
-`Clock` variable.
-
-
-### Mocking time
-
-In your tests, you will want to use a `Mock` clock:
-
-```go
-import (
-	"testing"
-
-	"github.com/benbjohnson/clock"
-)
-
-func TestApplication_DoSomething(t *testing.T) {
-	mock := clock.NewMock()
-	app := Application{Clock: mock}
-	...
-}
-```
-
-Now that you've initialized your application to use the mock clock, you can
-adjust the time programmatically. The mock clock always starts from the Unix
-epoch (midnight, Jan 1, 1970 UTC).
-
-
-### Controlling time
-
-The mock clock provides the same functions that the standard library's `time`
-package provides. For example, to find the current time, you use the `Now()`
-function:
-
-```go
-mock := clock.NewMock()
-
-// Find the current time.
-mock.Now().UTC() // 1970-01-01 00:00:00 +0000 UTC
-
-// Move the clock forward.
-mock.Add(2 * time.Hour)
-
-// Check the time again. It's 2 hours later!
-mock.Now().UTC() // 1970-01-01 02:00:00 +0000 UTC
-```
-
-Timers and Tickers are also controlled by this same mock clock. They will only
-execute when the clock is moved forward:
-
-```
-mock := clock.NewMock()
-count := 0
-
-// Kick off a timer to increment every 1 mock second.
-go func() {
-    ticker := clock.Ticker(1 * time.Second)
-    for {
-        <-ticker.C
-        count++
-    }
-}()
-runtime.Gosched()
-
-// Move the clock forward 10 second.
-mock.Add(10 * time.Second)
-
-// This prints 10.
-fmt.Println(count)
-```
-
-