Merge: mnit_simple : Refactoring of android modules tests

All mnit_simple tests have been refactored to multiple test files allowing to run tests on a module basis. A new folder named `tests` has been created containing these tests. Each test now has a Makefile entry based on that rule : `test_Module_Name`.

Pull-Request: #568
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>