Licenses for data not otherwise specified

• gender_data.csv - see matthew-brett/datasets. CC-BY, attribution to the World Bank.

• mosquito_beer.csv - see matthew-brett/datasets. CC-BY, attribution to Dr Thierry Lefèvre - see link above for detail.

• rate_my_course.csv - see matthew-brett/datasets. The license is not clear - see link for details. For now, assume CC-0.