Docker remove container before remove image (#928)

* add docker container removal

* remove container before deleting image

* update readme

* clean up and add assert not test

* test not docker command

* use shell.and_ correctly

tests/rules/test_docker_image_being_used_by_container.py

@@ -0,0 +1,27 @@
+from thefuck.rules.docker_image_being_used_by_container import match, get_new_command
+from thefuck.types import Command
+
+
+def test_match():
+    err_response = """Error response from daemon: conflict: unable to delete cd809b04b6ff (cannot be forced) - image is being used by running container e5e2591040d1"""
+    assert match(Command('docker image rm -f cd809b04b6ff', err_response))
+
+
+def test_not_match():
+    err_response = 'bash: docker: command not found'
+    assert not match(Command('docker image rm -f cd809b04b6ff', err_response))
+
+
+def test_not_docker_command():
+    err_response = """Error response from daemon: conflict: unable to delete cd809b04b6ff (cannot be forced) - image is being used by running container e5e2591040d1"""
+    assert not match(Command('git image rm -f cd809b04b6ff', err_response))
+
+
+def test_get_new_command():
+    err_response = """
+        Error response from daemon: conflict: unable to delete cd809b04b6ff (cannot be forced) - image
+        is being used by running container e5e2591040d1
+        """
+    result = get_new_command(Command('docker image rm -f cd809b04b6ff', err_response))
+    expected = 'docker container rm -f e5e2591040d1 && docker image rm -f cd809b04b6ff'
+    assert result == expected