Added matlab object saving

[sertansenturk]

Since many people incorporate MATLAB classes, it would be useful to support saving the (public) properties of matlab objects.

The code is tested for empty object, i.e. numel(obj) == 0; vector of objects. Currently, the code flattens 2D or higher dimensional array of objects to a vector.

[fangq]

thank you Sertan! people had requested this feature before.
your patch is in upstream now.

have you tested this with octave?

[sertansenturk]

No problem, I'm happy that I am able to contribute :)

I have not tested it with Octave, sorry. This might not also work on earlier versions of MATLAB (< 2007-2008), where class syntax was different as far as I know.

Also, it might be good to add this capability to saveubjson.m too. I didn't want to change it before the initial pull request was revised.

[fangq]

I have not tested it with Octave, sorry. This might not also work on earlier versions of MATLAB (< 2007-2008), where class syntax was different as far as I know.

it would be nice to use the existing "isoct" variable or opt.IsOctave field in the savejson to test for octave.

Also, it might be good to add this capability to saveubjson.m too.

that would be nice too

[sertansenturk]

Ok, I'll make another pull request for saveubjson.m later this week. For octave, it might take a couple of more days...