Curve fitting for numerical parameter

```
Caliper should support an estimate of complexity in Big O notation. Maybe done
through a particular runner, caliper could display what it guesses the
performance of your algorithm will be e.g.

O(1)
O(N)
O(N^2)

It could do this by looking using a parameter of size of the dataset instead of
just number of repetitions.
```

Original issue reported on code.google.com by `yuri.sch...@gmail.com` on 24 Feb 2011 at 9:05