Adding many-colors template

Sometimes high amount of distinct values are represented in the same graph.

The default colors provided by graphite-web only allow 12 distinct colors, and then they starts repeating.
Ideally dynamically generated colors would be awesome depending on amount of metrics that will finally be rendered.

I found a list of distinct values in a reponse of a stackoverflow thread: http://stackoverflow.com/a/20298027/3683292

Hope you like it, I find it very useful for my usage.