Plots.jl clean scientific formatting

As I know, this is a default setting in matlab and I think that there are many people want it works in GR backend of julia. In a publication, the “clean scientific formatting” looks space-saving and neat.

Well, maybe it could solve the problem NOW. But we hope that it works automatically, not manually. For some cases, the data has 10^14 scale, for other cases, the data has 10^-3 scale… we can’t manipulate them all.