Mainly small install script improvements - Consistent usage of `$LUANHOME`, removed reliance on current directory. - Made Luan build and install fine (on Linux) without requiring launching it via sudo. Only asks to elevate privileges if installation failed. - Minor spelling mistake fix.

#!/bin/bash

set -e

cd `dirname $0`;

if [ "$1" == "monitoring" ]; then
	if [ ! -f "started.lock" ]; then
		echo "stopped with stop script";
		exit 0;
    fi;
fi;
./stop.sh;
./start.sh;