Created business_hours schedule.  Change notifications to only send
WARNING and UNKNOWN notices during business hours.  DOWN, CRITICAL and
recovery notices come 24x7.
Updated "admins" contact group.  More clear name for
pagerduty-business_hours.
Remove noisy ping check that doesn't do much but tell us that Amazon is
slow.
Merge pull request #7 from VertiPub/td-nagios_schedule

Modified Nagios alert schedule.