change folders structure

New structure
Structure of folders
==============
Sudoku-C : main folder
+- configurations : This folder contains the config.xml
+- Lib : This folders contains all lib to use into the main program
+- outputs : Folder by default out output files. (cvs, txt and html)
+- unittests : This folder contains the unit test for the code
+- sources : This folder contains the resources to run the unit test

-  The support to html, txt and csv were added.
-   configuration.py was updated