Delete 'sss' package and 'scalding' code

 * Project def: get rid of 'scalding' sub-project
Change project definitions

 * Organization is 'YPG'
 * Scalac Settings: add 'reflectiveCalls' option
 * Spark Settings: make dependencies private
 * get rid of Avro definitions
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.
Split between Spark and 'normal' utilities
Creation of 'ypleads' package.

Initial population with Common structures to be used in the project.
Local Levenshtein replaced by com.rockymadden.stringmetric.similarity's
README: add general description + packages hierarchy
Proper population of util.Util

 * cleanString moved from ypleads.common
 * Creation of tests
Definition of Wrappers - specifically StringWrappers
Add TODO's for use of new types on registering tables
'util.Utils.completeSplit' replaced by '<string>.split(,-1)'
Utility String.clean points to CleanString
'CleanStringImpl' is private[this]
Merge pull request #5 from ypg-data/luis-addCommonStuff

Add utilities for data exploration