Add support for scope-level query and analytics RDD

import com.couchbase.spark._

import com.couchbase.client.scala.json.JsonObject

import com.couchbase.client.scala.analytics.AnalyticsOptions

val query = "SELECT ht.city,ht.state,COUNT(*) AS num_hotels FROM hotel ht GROUP BY ht.city,ht.state HAVING COUNT(*) > 30"

val options = AnalyticsOptions(Scope = Some("inventory"))

val result = sc.couchbaseAnalyticsQuery[JsonObject](query, options)

result.collect().foreach(println)