Improved "Jee setting" checks

Changed logic to check if device setting matches new setting first and
then if device setting is different or not available to check, then
proceed to change/set. This should prevent previously set non-default
settings being re-set at start up when using Jee devices on post
RF12demo.11 firmware.
Improved "Jee setting" checks

Minor changes to the way setting strings are tested for on post
RF12demo.11 devices.
Merge pull request #5 from emonhub/testing

Testing