CIDEVMI-1025 Added PARAD Classes

@cwingard Ready for review and merge
@s-pearce Ready for review and merge

I removed the opt_par_biospherical function and added the opt_par_biospherical_wfp and opt_par_biospherical_mobile functions to account for the two different Biospherical PAR sensors. I also updated the test_opt_functions module with the necessary nose tests.