updated Spectrum to inherit from Dotable.
updated Spectrum to inherit from Dotable.

sdss/marvin,bretthandrews/marvin,sdss/marvin,sdss/marvin,sdss/marvin,albireox/marvin,bretthandrews/marvin,albireox/marvin,bretthandrews/marvin,bretthandrews/marvin,albireox/marvin,albireox/marvin