Fixed tournamentSize -> tournamentProportion

I changed all the references in the tournamentSelection recipe to rather use tournamentProportion (got this from the field value tournamentProportion) than tournamentSize. The only place where "tournamentSize" was still used correctly, was when the tournamentProportion was multiplied with some List.size, which then results in a tournamentSize.

Added two line to .gitignore to filter out temp files as well.

Signed-off-by: Arné Schreuder <arn3@arn3.com>