Gsoc

It´s new pull request to update apache-rat-core.
Changes inside:
-Format Code.
-Add java doc.
-Delete Unused Variable.
-Apply PMD Rules.
-Refactor Test.
-Add test Class.
-Delete static context.
-Delete RatException
-Change in Abstract Class.
-Download latest release, Rat 0.10 
-Coverage up 4% Before 82% after 86%