Fix data initalisation and parameter names

[nocturnalastro]

Fixes the error caused by not passing the attributes into the __init__ as done by sherpa

[hamogu]

Thanks for looking after your old package again! Are you actively using it?
I checked the Travis failures, I think the two failures are real, and are essentially "code rot" where the environment has changed around us since the last saba release.

Astropy has refactored the testing packages, such that we now may have to install different / new dependencies for the testing. I've migrated one of my other packages recently, I'll see if I can propose a fix for that in a separate PR.

The second thing might be due to changes in the modelling. I'll open a separate issue for that, but I don't know on top of my head how to address that.
@nocturnalastro: What do you think?

[nocturnalastro]

@hamogu
I've not been using it unfortunately, probably why I've let the code get so rotten. I have a fix for the attribute error, It was due to some changes in astropy where the parameters are references instead of copies (by the looks of it). But the fix is very simple just use the loop variable which has the correct name, I fixed it last night but forgot to push it because I found something else to fix in astropy.

[nocturnalastro]

Ah yes this is how I noticed the problem with astropy so until get astropy/astropy#10002 sorted it we that won't pass unless I rewrite the examples in the docs.