openwrt stuff

Config changes to the openwrt to make it work:

problem:
pachube did not recognize my xml file as xml
solution:
create a /etc/httpd.conf file with this line:
.xml:application/xml

problem:
need to start at boot time the process that reads from serial port
solution:
follow this tutorial: http://oldwiki.openwrt.org/CustomStartupScripts.html

problem:
enable cron
solution:
follow this tutorial: http://oldwiki.openwrt.org/HowtoEnableCron.html

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