Bug fix in xkcdTree; xkcd Caribbean anole phylogeny

I just realized that there was a bug in xkcdTree, my function for plotting xkcd style phylogenies. Basically, the argument lwd (line width) was not being transferred to the function for drawing xkcd style lines. Oops. Here is a link to a fixed version, which also allows control of the horizontal & vertical dimensions of the plotted tree. Also, for fun, an xkcd tree of 100 Greater Antillean anole species, from Mahler et al. (2010):

> library(phytools)
> source("xkcdTree.R")
> tree<-read.tree("anole.tre")
> xkcdTree(tree,"anoleTree.pdf",fsize=1.0,lwd=3, dim=c(5,13),waver=c(0.05,0.05),jitter=0.0005)