adding bandpass for the Kepler spacecraft

[mrtommyb]

adding the response function found at
http://keplergo.arc.nasa.gov/CalibrationResponse.shtml

[kbarbary]

Cool!

Note that this alone won't allow one to automatically load the bandpass via, e.g., get_bandpass("kepler"). That requires adding a bit of code to sncosmo/_builtins/bandpasses.py. You can add it to this PR or I can do it after merging if you'd like.

[mrtommyb]

if it is as simple as adding the code below then I can do this. Is there anything else?

kepler_meta = {
    'filterset': 'kepler',
    'retrieved': '14 Jan 2015',
    'description': 'Bandpass for the Kepler spacecraft',
    'dataurl': 'http://keplergo.arc.nasa.gov/CalibrationResponse.shtml,}
registry.register_loader(Bandpass, 'kepler', load_bandpass,
                         args=['../data/bandpasses/kepler.dat'], meta=kepler_meta)

[kbarbary]

Yep, that's it!

[kbarbary]

Thanks! The test failure is just due to the PEP8 style checker which gets run automatically.