Added new test_data directory for test images

test/test_kboot.py

@@ -34,9 +34,9 @@ class TestKbootHeader(object):
             self.check_size(data)
     
     def test_real(self):
-        data = np.fromfile("air_defense_v18.xex", dtype=np.uint8)
+        data = np.fromfile("../test_data/air_defense_v18.xex", dtype=np.uint8)
         image = self.check_size(data)
-        with open("air_defense_v18.atr", "wb") as fh:
+        with open("../test_data/air_defense_v18.atr", "wb") as fh:
             txt = image.tostring()
             fh.write(txt)