[julia-users] Gadfly: Text labels rather than numbers along x-axis of plot?

[cormullion]

Given this simple graph:

    plot(x=1:12,y=rand(5), Guide.xticks(ticks=[1:12]))

where the 12 values correspond to the months January through December.

Instead of seeing 1 ..12 along the x-axis, I'd like to see the month names. 
Is this possible?