[crunchstat-summary] Support multiple data series per graph (e.g. TX/RX, user/sys CPU, etc)
Currently we graph a number of aggregate statistics such as user+sys CPU and TX+RX network bandwidth when we'd really like to see each individually (plus total, perhaps). We should take advantage of the underlying dygraph implementation's support of multiple data series to plot all of the useful information on the same graph.
We may also be able to use this to draw in a max/total limit line (using just 2 data points) for things like RSS and temp disk space to provide a quick visual representation of how close to the limit the job came.