Support standard deviation in the statistical metrics gathered #13

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Because it's a good metric, heck it's a nessesary metric.

In case you've forgotten some of stats 101:

  • Variance shows how spread out the numbers are, hence the name. It is basically computed as the average distance from the mean.
  • Standard deviation is basically each distance from the mean, like with the variance, only squared (so as to avoid having negative numbers) then averaged and square rooted.

I changed the app/models/probe.rb to support add support for standard deviations, not sure if it's the right spot but seemed the best (although the documentation only mentioned averages so I changed that).
I havent tested it to be honest, the method exists in rstats so it should be peachy-fine but nevertheless you've been warned.

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