Removed hardcoded paths and made them dynamic

	new file:   config.php
	modified:   get_beer_files.php
	modified:   logs.php
	modified:   program_arduino.php
	modified:   socketmessage.php
	modified:   start_script.php
Merge pull request #3 from rparenton/master

Fix for http://mantis.brewpi.com/view.php?id=5