Util: add DateTime and Hadoop helpers

plus add stuff on Project
as mentioned [here](https://spark.apache.org/docs/latest/tuning.html) you should probably try using kryo serialization. scalding uses it too, and [this](https://github.com/ypg-data/scalaboot/blob/master/scalaboot-scalding/src/main/scala/sss/scalding/package.scala#L22) is an example of something i needed to add for avro support there. i'm ok as long as a ``TODO`` or ``FIXME`` is added for this