Game rules now says which player is next.

This is useful for games like Dots where depending on the executed move a
player can move again.
Also lowered kestrel READ_TIME_WAIT_INTERVAL from 0.1 to 0.01 seconds.
Renamed test_games into games.
Added the dots game - Warning this commit may be invalid as it contains
untested changes.
Removed a debug script which was accidentally commited to the repo.
Removed game_images from gitignore (for now).

There was this incosistency with games being present in the eval but the images
for them were not commited to the repo. Until I figure out how to correctly
deal with this game images will be uploaded to the repo.
When refactoring the player ais in a previous commit for one of the player I forgot
to remove the old version (for player1).
Added dots game ais and fixed bugs.

* Added two ais for the dots game
* Fixed several small bugs that appeared when trying to play a round containing
those two ais.
In the round_standings view the round-id provided in the url was considered to
be the round_id instead of the round_index.