Adding inital gradle build to show what this might look like.
Added gradle wrapper support.
Added some comments, a source jar, and an slf4j-log4j12 testing dep.
Populate test jar with output (compiled code) rather than input (source).
Build javadoc and source jars for crunch project as well.
Use the full gradle zip for the wrapper for source/docs in IDEs.
Removed jcenter repo.
Added gradle.properties with config info.
Replaced dep versions and other bits with properties.
Added support for cdk-data-hbase.
Updated formatting of the gradle build script to conform with project standards.