This commit touches a subset of UPM sensors which contain C source.
Cleaned up the CMakeLists.txt DESCRIPTION field to better represent
the library.
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>
