The float type is sort of really implemented now

I added a PULL api call, which you can use as "PULL <module name>",
the module has to be enabled though. It'll simply reply with
"<module name>: <data>". Data can atm only be a float, this will
change in the future of course. Currently sample module will always
return 0.0.

Signed-off-by: Toon Schoenmakers <nighteyes1993@gmail.com>