* Removed relay and rotary from grove library
* Removed relay and rotary from grove SWIG interfaces
* Fixed warning for o2 printf %
* Fixed return value warning for _get_normalized method used by
my analog sensors.
Signed-off-by: Noel Eck <noel.eck@intel.com>
Added the C source for the O2 sensor with necessary changes to cmake,
examples, docs.
* Renamed all files with groveo2 to o2
* Replaced all instances of groveo2 with o2
* Added C source for o2 sensor
* Updated all cmake files
* Added C example for o2 sensor
Signed-off-by: Noel Eck <noel.eck@intel.com>
