SN Ia + host galaxy example workflow

[mi-dai]

Simulating SN Ia light curves using the SALT model in sncosmo. Added toy relation between x1 and hostmass. Simple opsim applied for cadence (no filter info).

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Before [a5acdab2]	After [55ac3b22]	Ratio	Benchmark (Parameter)
1.23±0.02s	1.23±0.02s	0.99	benchmarks.time_chained_evaluate

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