Docstring display fix
Name of the opponents is not available by a mouseover on the results
table.

fixes #6
HTML payoff matrix now display normalized payoff, color by std.

- The HTML payoff matrix display now a normalized payoff between 0 and
  100. (x-max/min-max).
- The color of a cell is determined by the number of standard deviation
  from the mean. if <0.5std : blue, else green or red depending on the
  sign
- You can still read the non normalized payoff by doing a mouseover.
- Max value is in bolder font

fixes #1