Add specs for constants in bson root
Add specs for constants in bson root

ukblewis/bson-ruby,agis-/bson-ruby,agis-/bson-ruby,estolfo/bson-ruby,mongodb/bson-ruby,hudon/bson-ruby,ukblewis/bson-ruby,johnsimon/bson-ruby,hudon/bson-ruby,mongodb/bson-ruby,mongodb/bson-ruby,estolfo/bson-ruby,johnsimon/bson-ruby,hudon/bson-ruby,estolfo/bson-ruby,agis-/bson-ruby,estolfo/bson-ruby,ukblewis/bson-ruby,mongodb/bson-ruby,johnsimon/bson-ruby,ukblewis/bson-ruby