Attempt to create "sites" folder on start (fix #32)

main.go

@@ -102,6 +102,11 @@ func main() {
 		go handler(data) // Run the handler
 		fmt.Fprint(w, "Received!")
 	})
+	// Attempt to create sites_dir
+	if exists, _ := fileExists(configuration.sites_dir); !exists {
+		os.Mkdir(configuration.sites_dir, 640) // Permissions are 640 (Owner: rw, Group: r, All: none)
+	}
+
 	log.Printf("Starting Lapis Deploy on port %d...", configuration.port)
 
 	startAllSites()       // Start all the servers