Use Cache-Control: no-transform so that the response can be cacheab…

…le (#175)

lib/phlex/rails/streaming.rb

@@ -8,7 +8,7 @@ def stream(view)
 		headers.delete("Content-Length")
 
 		headers["X-Accel-Buffering"] = "no"
-		headers["Cache-Control"] = "no-cache"
+		headers["Cache-Control"] = "no-transform"
 		headers["Content-Type"] = "text/html; charset=utf-8"
 		headers["Last-Modified"] = Time.now.httpdate