Removes circular reference in robot.brain

Removes the circular reference to robot when saving to the brain.

Includes a DRY'er version of saving to the brain.
Fixes statistics reporting

Handle NaN calculations. Also stats are now per player by default
to cut down on channel spam.
Fixes reset to use DRY save() method
Fixes stats output
Fixes sounds in 1_4_24
Merge pull request #1008 from sukima/fix_one_four_twentyfour_game

Fixes many bugs in One Four Twentyfour game
github issues now advises githubot 0.4.0 in order to add a user-agent
Merge pull request #1009 from orta/patch-1

Github issues now advises githubot 0.4.0 in order to add a user-agent