Uses Aplpy FITSFigure in Npred plots

Still a few things to do here (I haven't figured out how to do these yet).
- [ ] Add colourbars to the plots
- [ ] Use better colour scale for the background ratio image
- [x] Add titles to each of the subplots

Anything else?
I don't know ... I'll only have time to try this out late on Friday.