WIP: HashFromNode and VerifyDepTree

internal/gps/_testdata/src/cycle/a.go

@@ -6,6 +6,7 @@ package cycle
 
 import (
 	"cycle/one"
+
 	"github.com/golang/dep/internal/gps"
 )
 

internal/gps/_testdata/src/cycle/one/a.go

@@ -6,6 +6,7 @@ package one
 
 import (
 	"cycle/two"
+
 	"github.com/golang/dep/internal/gps"
 )
 

internal/gps/_testdata/src/cycle/two/a.go

@@ -6,6 +6,7 @@ package two
 
 import (
 	"cycle"
+
 	"github.com/golang/dep/internal/gps"
 )
 

internal/gps/_testdata/src/missing/a.go

@@ -7,8 +7,9 @@ package simple
 import (
 	"sort"
 
-	"github.com/golang/dep/internal/gps"
 	"missing/missing"
+
+	"github.com/golang/dep/internal/gps"
 )
 
 var (