home_group.py: Renamed from send_messages.py
home_group.py: Moved login details into a separate file
gdocsreader.py: Added parse_date
gdocsreader.py: Contact should tolerate not having a phone_no or e-mail
gdocsreader.py: Added PA/PowerPoint Rota parsing
pa_powerpoint.py: Added a script to send reminders about PA/PowerPoint