Fixed #272: Catching more appengine package locations

dependency/resolver.go

diff --git a/dependency/resolver.go b/dependency/resolver.go
index 8201589..6d59ad3 100644
--- a/dependency/resolver.go
+++ b/dependency/resolver.go
@@ -802,7 +802,9 @@
 	if name == "C" {
 		info.Loc = LocCgo
 		r.findCache[name] = info
-	} else if name == "appengine" || strings.HasPrefix(name, "appengine/") {
+	} else if name == "appengine" || name == "appengine_internal" ||
+		strings.HasPrefix(name, "appengine/") ||
+		strings.HasPrefix(name, "appengine_internal/") {
 		// Appengine is a special case when it comes to Go builds. It is a local
 		// looking package only available within appengine. It's a special case
 		// where Google products are playing with each other.