Add request Id for Druid calls

Add request Id for Druid calls based on X-Request-Id and X-ILB-Request-id inserted by external Haproxy and internal HaProxy, respectively.

v0.1.13

Client#send will pass query to broker_uri method since H4Druid::Query#broker_uri needs the query.

v0.1.12

Removed Zookeeper dependency from Druid client.

v0.1.11

Ruby 2.4 support.

v0.1.10

• Custom javascript filters
• Min, max and select