Update functions.inc

added features to add a ROLE field which will be indicated by a small icon next to the name.
role "other" currently doesn't have an icon, but it can be changed easily.
Update index.php

added POST variable for 'role'
added array "roles"

empty role does not break index.php, it just includes the empty img tag
Update functions.inc

revert to refresh every 5 seconds to 'lunch.cldsrvr.com'
reordered ROLES list so that other is default, rest are alpha order.
added 'alt' text for names which shows sequential ID from DB, though this will be removed in future updates since entries are in ID order, left to right.
added classes to icons.
added icon key.
changed header row to 'th' elements instead of 'td'
changed table width to 50%, column widths to 20%, set no-wrap for td.
removed DATE criterion from del_from_schedule function in case user wants to delete entry older than X hours.
added padding for role-icons.
centered all table text.
updated README to reflect mysql table columns
Merge pull request #7 from joeashcraft/master

add optional 'role' indicated by icon