Shortening some debug strings.
Tidying up
Fixing bug with xbee code when no xbee present.
Don't assume port 80, put port into config.
Long polling! Squashed commit of the following:

commit a0bbcc1cc3bd90b810c9999630be51fb520c930f
Author: John McKerrell <john@mckerrell.net>
Date:   Fri Sep 27 18:07:49 2013 +0100

    Don't delay between samples. Rejig sampling frequency.

commit 7b3e8a26a9ff6829922e5536415d94c903b5bda1
Author: John McKerrell <john@mckerrell.net>
Date:   Fri Sep 27 18:07:20 2013 +0100

    Working long polling code.

commit 3e1345b956d1eb67d2e2f4dfeffbf6a87604369b
Author: John McKerrell <john@mckerrell.net>
Date:   Fri Sep 27 17:56:37 2013 +0100

    Output the IP address of the YAHMS instance.
Updating readme
Re-jigging YAHMS_Local