Added rfm quite mode

Enables quite mode to be selected/deselected in configuration file,
defaults to quite mode to suppress bad packets being passed from Jee
type devices. can be omitted from configuration file for normal use,
adding quiet = false will allow bad packets to be presented to emonhub
for in-house checks/verification. quiet = true will only allow ""good
packets" to be passed to emonhub.
Merge pull request #107 from otherWIP/testing

Added rfm quite mode