Vendor godep v79 and use it

vendor/github.com/tools/godep/doc.go

@@ -0,0 +1,22 @@
+/*
+
+Command godep helps build packages reproducibly by fixing
+their dependencies.
+
+Example Usage
+
+Save currently-used dependencies to file Godeps:
+
+	$ godep save
+
+Build project using saved dependencies:
+
+	$ godep go install
+
+or
+
+	$ GOPATH=`godep path`:$GOPATH
+	$ go install
+
+*/
+package main