updated readme

Added support for HTU21D humidity sensor

Updated readme

Improved CMake versioning

Added SOVERSION to RTIMULibGL library in CMake build

Added SOVERSION to CMake build library

Added humidity infrastructure and HTS221 support

Added support for the Bosch BNO055 IMU

Added second order temperature compensation for MS5611 and MS5637

Added support for BMX055 IMU and MS5637 pressure sensor