Socket library updates to support detecting sockets passed as FDs, removed use of peek() in HTTP request handler, fixed 100% CPU usage problem for unfinished HTTP requests

src/output/output.cpp

@@ -528,6 +528,7 @@ namespace Mist{
     }
     
     if (!keepGoing()){
+      INFO_MSG("Aborting page load due to shutdown");
       return;
     }