go dep

Migrated from plain /vendor to go dep

vendor/github.com/codegangsta/negroni/response_writer_pusher.go

@@ -0,0 +1,16 @@
+//+build go1.8
+
+package negroni
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func (rw *responseWriter) Push(target string, opts *http.PushOptions) error {
+	pusher, ok := rw.ResponseWriter.(http.Pusher)
+	if ok {
+		return pusher.Push(target, opts)
+	}
+	return fmt.Errorf("the ResponseWriter doesn't support the Pusher interface")
+}