Better docs of grid search parameters

[jakevdp]

I need to better document how to use the grid period search effectively (see #3)

[jakevdp]

See #7 and #8 – when I cut a new release in a couple days, I'll build the docs and publish them at http://astroml.org/gatspy/

[jakevdp]

Take a look at this (note that it will render better when I build the docs). Any comments?

[jakevdp]

The discussion is live in the documentation now Hopefully that helps!