message: updated performance statistics
diff: @@ -107,15 +107,20 @@ I ran both on my mac-book, doing the following:<BR>
  Result:
  ```bash
  Prompt> time python pandas_performance.py
  -Killed: 9
  +All memory allocations are done. Calculating means ...
  -real 11m45.649s
  -user 2m59.348s
  -sys 2m59.555s
  +real 17m18.916s
  +user 4m47.113s
  +sys 5m31.901s
  Prompt>
  Prompt>
  Prompt> time ../bin/Linux.GCC64/dataframe_performance
  -real 7m10.931s
  -user 2m55.901s
  -sys 2m37.538s
  +All memory allocations are done. Calculating means ...
  +
  +real 6m40.222s
  +user 2m54.362s
  +sys 2m14.951s
  ```
  +The interesting part:<BR>
  +In case of Pandas allocating memory and calculating means take almost the same time.<BR>
  +In case of DataFrame 85% of the time is spent in allocating memory.
  