added scheduler.py

scheduler.py is a script that controls telldus tdtool binary
to power on and off certain remote controllable power sockets

usecase: read outside temperature at certain time of day and
based on that switch power socket on to start car heater

heating time is calculated from temperature and configured time
when car needs to be ready to start

not most beautifull ever but so far it has been functional

note that implementation is heavily based on my environment, may
not be usable as is in any other setup :)

Signed-off-by: Jukka Laukkanen <jukkalau@gmail.com>