Compatibility with stock Druid 0.15

[duya...@gmail.com]

Hello, 

Is it possible to get Metatron to run with Apache Druid 0.15? 

Because I want to use Druid API to do some direct data manipulation, re-indexing on Druid but this is not supported by Metatron.

Also, there are a couple of new features in Apache Druid that not yet available in Metatron Druid because it was customized based on a fairly old version of Druid (0.9.x I think).

Thanks,

Anh