Add fill value to cutout (#284)

* added fill value to Cutout constructory

* fixed except clause

* flake8 fixes

* Delete test.py

dummy file

* Update transforms_interface.py

remove unnecessary if statements

* added fill value to CoarseDropouty

* fixed update params

* switched fill_value to optional in apply()

* fixing test fails

* fixed signatures

* flake8 fixes

* more flake8 fixes

* fixed mistake in params dictionary

albumentations/core/transforms_interface.py

@@ -98,7 +98,7 @@ def update_params(self, params, **kwargs):
         if hasattr(self, 'interpolation'):
             params['interpolation'] = self.interpolation
         if hasattr(self, 'fill_value'):
-            params['interpolation'] = self.fill_value
+            params['fill_value'] = self.fill_value
         params.update(
             {'cols': kwargs['image'].shape[1],
              'rows': kwargs['image'].shape[0]})