Change the node color in cnetplot #40
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跑五个例子出来看看：
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之前的cnetplot作图时，当遇到foldchange有正有负时，foldchange接近于0的节点会偏离中间颜色。
此次对cnetplot节点的颜色进行了调整，以使其在foldchange有正有负时，foldchange为正的基因在blue到red渐变，foldchange为负的基因在blue到green渐变，foldchange接近于0时，节点颜色为blue。
代码中所做的更改为：
1、
cnetplot.enrichResult函数的scale_color_gradientn改为scale_colour_gradient2。2、
fc_palette函数用不到了，在utilities.R中将它注释掉了。