Make docs consistent re: default/min parameters

[fedarko]

I think there might still need to be some changes made regarding parameter names (since it looks like --rank has been changed to --n_components, and --iterations has been changed to --max_iterations), but I'm not sure what to do there.

this is a low priority fix so no worries :)

[fedarko]

Added another commit that shills Qurro's moving pictures tutorial, now that that's ready :P

[cameronmartino]

@fedarko this looks okay to merge. thank you!