Fixed previous bug, Current: join not well defined
Fixed previous bug, Current: join not well defined

- previous bug was becuase a list was assigned to `dat.object_names`.
  Changed this to `np.ndarray`, and added some features in snmachine to do
  the right thing anyway.
- Current problem is on the join of two tables: I am not sure I
  understand what we want to do here.

	modified:   Generate_Mock_Lightcurves.ipynb

rbiswas4/FeatureRobustness