#782 Add method for checking whether the current time is within an operational period.
#782 Update main inbound_sms method so that it checks the time period using the new dedicated method.
#782 Add method to send a 'Not Registered' SMS reply.
#782 Add number_is_registered method to datahandler interface.
#782 Add method to mongoconnector to get registration status for a mobile number.
#782 Slightly alter message.
#782 Perform registration check on new inbound SMS.
#782 Tidy up.
Don't need that line
Merge branch 'feature/#782-Mobile_Numbers_Will_Be_Required_To_Register_Before_Using_Service' into develop
Update version and README.
Merge branch 'release/1.13.0' into develop