Prepare to refactor static methods into object by reducing visibility of methods and removing duplicate tests.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549153 13f79535-47bb-0310-9956-ffa450edef68
Push static method into instance.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549154 13f79535-47bb-0310-9956-ffa450edef68
Inject configuration through constructor.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549155 13f79535-47bb-0310-9956-ffa450edef68
Inlined static method

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549159 13f79535-47bb-0310-9956-ffa450edef68