Change project definitions

 * Organization is 'YPG'
 * Scalac Settings: add 'reflectiveCalls' option
 * Spark Settings: make dependencies private
Log Settings: add Spark dependency to make it work

* NB: this *shouldn't* be needed, but I couldn't make it work otherwise. TODO is on the code.
Creation of 'ypleads' package.

Initial population with Common structures to be used in the project.
Split between Spark and 'normal' utilities