Add JRuby to matrix
Add JRuby to matrix

ukblewis/bson-ruby,estolfo/bson-ruby,mongodb/bson-ruby,estolfo/bson-ruby,mongodb/bson-ruby,estolfo/bson-ruby,ukblewis/bson-ruby,estolfo/bson-ruby,mongodb/bson-ruby,ukblewis/bson-ruby,mongodb/bson-ruby,ukblewis/bson-ruby