Allow non-zero ramp times on the first step; start from min temperature

Author: nylen

lib/Scheduler.js

@@ -191,10 +191,6 @@ Scheduler.prototype.validateSchedule = function(schedule) {
         }
     });
 
-    if (schedule[0].rampMinutes > 0) {
-        throw new Error('First step cannot have non-zero ramp time');
-    }
-
     return schedule;
 };