Ashish Negi

This is the issue : [antlr/antlr4 issue](https://github.com/antlr/antlr4/issues/1540)

I have not yet benchmarked other targets, but here is perf top10 results for 100 iteration of `only lexing` of a query : ``` ashishnegi@ashish:~/work/golang/src/github.com/dgraph-io/dgraph/query$ go tool pprof query.test cpu4.out...

After [benchmarking](https://github.com/ashishnegi/dgraph/blob/bench-antlr4/antlr4go/graphqlpmcpp/GraphQLPM.cpp) with cpp target : Only lexing on `nestedquery` query for 1 million times => average time is `~42 microseconds`. Same query in golang target takes on average `~3.3...

Thanks. Documentation is actually good for getting started. 👍 for the efforts. I am trying to add support for Garhwali, a dialect of Hindi. I think, I might need to...