Add linewidth option geom_path and geom_point.

[Symaxion]

This PR adds an aesthetic option to geom_point and geom_path (and its derivatives, such as geom_line) to customize the width of the lines drawn (by passing the linewidth property). This is implemented by simply delegating to the lwd option of the grid library.

[hadley]

Why do you need this instead of size?

[Symaxion]

I didn't realize the size option was available for geom_path. What I was specifically looking for was increasing the border thickness of geom_point shapes 21-25, which seems to be a common issue:

• http://stackoverflow.com/questions/19506630/control-point-border-thickness-in-ggplot
• http://stackoverflow.com/questions/17677687/change-thickness-of-a-marker-in-ggplot2

I only really added the same option to geom_path as an afterthought. If you want, I can resubmit the patch only for geom_point.

[hadley]

Ah, got it - yes, I'd love a PR that just modified linewidth for geom_point. Maybe call the aesthetic stroke? Or strokewidth? I think you'll also need to update draw_legend() and it might be worthwhile thinking about what the default scale for stroke should be.

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