Version: 1.3.7
*Fixed delay payment isue for guest customers
*Fixed double start date fields on the variable subscription with default-product delay.
*Delay payment of first period
*Admin can change start date and schedule subscriptions
*Maximum number of date displayed for variations
*bulk edit start date for variable subscriptions
*restrict max date in the calendar
*Fix the ID calling method in product page
*Fixed wrong month in start date option for variable subscritpion
*Added custom date format for start date option for variable subscritpion
*Fixed display of max date and label in the subscription editng page