Util: add DateTime and Hadoop helpers

Includes new sbt configuration changes needed.
Util: no obvious need for Serializable

Added TODO to take care of it in case of need.
Merge pull request #1 from ypg-data/luis-addUtilities

Util: add DateTime and Hadoop helpers
Util: add DateTime and Hadoop helpers
Delete 'sss' package, since it belongs to an ancestor project
Creation of 'ypleads' package.

Initial population with Common structures to be used in the project.