Added test code for norbsmall and foveated norb. More on the way.

Datasets remaining to be processed on this thread:
- cos dataset
- MNISTPlus

PS: Need to check cos_dataset. Should it be transferred to create object of DenseDesignMatrix class?

Ok, seems like you can actually pass the data in topo_view instead of passing data_x and view_converter.Even this works, I'm not sure why you had to change that? The previous style is working and is more consistent with rest of library.