Added DECaLS text. Should address #214. Illustris tree can be mapped to sloan.
Added DECaLS text. Should address #214. Illustris tree can be mapped to sloan.

alexbfree/Galaxy-Zoo,murraycu/Galaxy-Zoo,zooniverse/Galaxy-Zoo,zooniverse/Galaxy-Zoo,willettk/Galaxy-Zoo,alexbfree/Galaxy-Zoo,murraycu/Galaxy-Zoo,willettk/Galaxy-Zoo,zooniverse/Galaxy-Zoo,murraycu/Galaxy-Zoo,willettk/Galaxy-Zoo,alexbfree/Galaxy-Zoo