Use a vendor directory for repeatable builds - fixes #816

This is using godep to manage the vendor directory.

vendor/github.com/ncw/swift/compatibility_1_1.go

@@ -0,0 +1,24 @@
+// Go 1.1 and later compatibility functions
+//
+// +build go1.1
+
+package swift
+
+import (
+	"net/http"
+	"time"
+)
+
+// Cancel the request
+func cancelRequest(transport http.RoundTripper, req *http.Request) {
+	if tr, ok := transport.(interface {
+		CancelRequest(*http.Request)
+	}); ok {
+		tr.CancelRequest(req)
+	}
+}
+
+// Reset a timer
+func resetTimer(t *time.Timer, d time.Duration) {
+	t.Reset(d)
+}