Initial version with REST query system

Embedded Druid can be used as a starting point for simple stand-alone applications that require Druid, or for applications that require an embedded Druid for testing.

This version is forked from eBay/embedded-druid. It adds the following features:

1. Execute JSON Query strings
2. Start and stop servers containing indexed data
3. REST endpoint to query the indexes
4. Additional JSON parsers to handle a few aggregators not available in the DefaultObjectMapper

Use the original-embedded-druid-1.0.jar if you are providing all the dependencies, or the embedded-druid-1.0.jar if you want the executable fat jar.