Library for ADS 1231 (bee hive weigh scale)

@peekay123 Finally I found the time to start porting the library: https://github.com/jensfranke/ads-1231-particle-library

The values from the weigh scale looks fine, but it would be nice if you can verify my particle library, especially the lines with the check-function.

Arduino Library: https://github.com/jensfranke/ads-1231-particle-library/blob/master/arduino-src/ADS1231.cpp#L64-L70

Particle Library: https://github.com/jensfranke/ads-1231-particle-library/blob/master/particle/ADS1231.cpp#L65

Next step is to test the power off function for power-down the ADS and write a function for a standby mode to reduce the power consumption.

Thanks in advance for your help & hints for refactoring the library.