#772 Add method to mongoconnector for retrieving Landline using a registration plate.
#772 Add method to DataHandler interface.
#772 New method within def move() to return either a string containing "Landline: xxxxxxxx" or an empty string.
#772 Include string returned by get_landline_number_string() in message to the blockee.
#772 Minor refactoring.
#772 Tweak method.
#772 Tweaks to MOVE response messages to include landline and remove unnecessary characters.
Merge branch 'feature/#772-include_landline_numbers_in_move_responses' into develop
#712 Update WHOIS so that an empty response is sent back to Twilio.
Remove redundant line.
#712 More descriptive variable name.
#712 Remove unnecessary return when no registration plate specified.
#712 Change prints to log.infos.
#712 Remove unnecessary TwiML from responses.
#712 Send an SMS via chosen SMS provider to respond to WHOIS command.
#712 Convert more of the WHOIS code to use SMS provider.
Merge branch 'feature/#712-Remaining_SMS_responses_are_sent_via_spsms' into develop