title: Not resolving dependency in vendor directory
body: <p>I'm running go1.6 and am getting the follow error when running "go build" in GOPATH (/Users/bweidlich/Projects/go)</p>
  
  <pre><code>main.go:6:2: cannot find package "github.com/spf13/viper" in any of:
  /usr/local/go/src/github.com/spf13/viper (from $GOROOT)
  /Users/bweidlich/Projects/go/src/github.com/spf13/viper (from $GOPATH)
  </code></pre>
  
  <p>Project structure:</p>
  
  <pre><code>bin/
  glide.lock
  glide.yaml
  go.iml
  logs/
  main.go
  pkg/
  src/
  vendor/
        github.com/
                   deckarep/gosx-notifier
                   spf13/viper
                   gizak/termui
  </code></pre>
  
  <p>main.go</p>
  
  <pre><code>package main
  
  import (
      "fmt"
      "github.com/gizak/termui" &lt;--- doesn't resolve
      "github.com/spf13/viper"  &lt;--- doesn't resolve
      "log"
      "bweidlich/dash"
      "net/http"
      "os"
      "os/exec"
      "time"
  )
  </code></pre>