Add Logging with 'Scala-logging' + 'Logback'

Includes:
- TODO: Unify configurations
- Logging: configuration is scanned for reloading on change
Logging: Add Dependencies for TreeLog
Util: extend 'fileExists' + 'rename' functionality
Util: add 'listOfFilesInFolder'
[util pkg] Creation of structure 'ParquetFile'
squash: commenting on 'loadFromHDFSFolder'
Add TODO: link ParquetFile with Scalaz's Monoid
Do not provide empty smart constructor - just 'apply' is fine
loadFromFolder: make it fail if not implemented
[sbt Project] Do compilation with extra flags
Add Metadata semantics. Restrict 'ParquetFile' constructors
HDFS: listing of files is now called 'ls'
Util test: shared a non-existent directory name
HDFS.deleteFile -> 'rm' Extra documentation
Util test: stop removing source file on 'mv'
ScalacSettings now contains all Scala compiler flags
Add TODO for work in the future (Rollbacks for operatiosn + better traversal of directories)
Add functionality to parse text files to RDDs
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