fboard pp engine

[jhammerstein]

The Freeboard post processing engine replaces Thingspeak. Goal is to make the data received by sensors available in graphs. For a first implementation only hourly and daily averages of humidity and temperature will be provided, as well as daily users of umbrellas. Implementation can be divided into following steps:

• [x] implement the Adapter with OurMQTT

• [x] implement main method for creating and starting the adapter

• [x] implement a version of tools so the Adapter can be tested

• [x] figure out required JSON format through testing

• [x] specify the tools so they calculate the desired numbers

• [ ] find bug of the subscriber

[jhammerstein]

Updated the to-dos to how i actually proceeded