add missing index options
add missing index options

specifically I was missing 'language_override' in my project and had to create the index manually
I've also add 'storage_engine' although I'm not sure what it does

based on
http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/
jbrien/mongoid,uniiverse/mongoid,mongodb/mongoid,kay-kim/mongoid,joshsoftware/mongoid,nicolasblanco/mongoid,uniiverse/mongoid,Zhomart/mongoid,jonhyman/mongoid,Welovroi/mongoid,mongodb/mongoid,Zhomart/mongoid,narutosanjiv/mongoid,Sharevari-Inc/mongoid,drobune/mongoid,mongodb/mongoid,drobune/mongoid,jonhyman/mongoid,estolfo/mongoid,narutosanjiv/mongoid,Welovroi/mongoid,estolfo/mongoid,herimedia/mongoid,herimedia/mongoid,rinmu/mongoid,joshsoftware/mongoid,kay-kim/mongoid,tzar/mongoid,Sharevari-Inc/mongoid,tzar/mongoid,rinmu/mongoid,jbrien/mongoid,nviennot/mongoid,nviennot/mongoid