Adding the method calibrate

neosensor/libraries/neocampus_drivers/generic_driver.cpp

neosensor/libraries/neocampus_drivers/generic_driver.h

neosensor/libraries/neocampus_modules/airquality.cpp

neosensor/libraries/neocampus_modules/airquality.h

neosensor/libraries/neocampus_modules/base.cpp

neosensor/libraries/neocampus_modules/base.h

neosensor/libraries/neocampus_modules/humidity.cpp

neosensor/libraries/neocampus_modules/humidity.h

neosensor/libraries/neocampus_modules/luminosity.cpp

neosensor/libraries/neocampus_modules/luminosity.h

neosensor/libraries/neocampus_modules/temperature.cpp

neosensor/libraries/neocampus_modules/temperature.h