Refactor everything to use nsq instead of hosting a http server

The point of this is (hopefully) some sort of resiliency
I do not want to lose any messages ever
And I want to be able to kill this process whenever it is misbehaving
Hopefully this achieves that goal

downloader/types.go

@@ -1,8 +1,5 @@
 package main
 
-type DownloadTask struct {
-	Url string
-}
 type DownloadRequest struct {
 	Link string `json:"link"`
 }