Add gene_labels and labels to plot_genes()

[leehart]

Re: issue #407

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[alimanfoo]

Looking good...

[alimanfoo]

Hi @leehart, couple of comments...

One very small request, would it be possible to add just a little more vertical padding around the text labels? Particularly the negative strand gene labels are touching the gene rectangles, would be good to have a little padding.

The other request is that ultimately this will be needed as part of functions like plot_h12_gwss() where there is a genes track plotted below some other data track. So basically, could you add a gene_labels parameter to all functions like this, i.e., where plot_genes() is called internally?

[leehart]

@alimanfoo How does this padding look to you?

Ideally I'd like a more robust mechanism for accommodating these labels, because this is currently tailored to the default height of the plot, i.e. 120, so specifying a different height, e.g. height=240, results in a skewed layout, e.g.