add vaportrail support

builder/stage4/30-pisdr-vaportrail/00-run.sh

@@ -0,0 +1,16 @@
+#!/bin/bash -e
+
+on_chroot << EOF
+mkdir -p    "/home/${FIRST_USER_NAME}/PiSDR/Software"
+cd 		    "/home/${FIRST_USER_NAME}/PiSDR/Software"
+
+if [ ! -d "vaportrail" ]; then
+    mkdir -p vaportrail
+fi
+
+cd vaportrail
+wget https://github.com/inguardians/VaporTrail/releases/download/0.1.0/vaportrail-rpi2-and-rpi3.tar.gz
+tar -xvzf vaportrail-rpi2-and-rpi3.tar.gz
+cp vaportrail /usr/bin/
+rm *.tar.gz
+EOF