added Tinker app functions
added Tinker app functions

This is to read and write the GPIOs with the Tinker app from Spark.io.

Careful with the write functions...

Signed-off-by: Falko Zurell <ca2b9553c6dbbf7104c31dc646719e7885ad4c96@gmail.com>

maxheadroom/temp_logger,maxheadroom/temp_logger,maxheadroom/temp_logger,maxheadroom/temp_logger,maxheadroom/temp_logger