Added support for url buid paths

Signed-off-by: Jonas Eckerström <jonaseck@gmail.com>

tests/unit/config/config_test.py

@@ -1497,6 +1497,20 @@ class BuildPathTest(unittest.TestCase):
         service_dict = load_from_filename('tests/fixtures/build-path/docker-compose.yml')
         self.assertEquals(service_dict, [{'name': 'foo', 'build': self.abs_context_path}])
 
+    def test_valid_url_path(self):
+        valid_urls = [
+            'git://github.com/docker/docker',
+            'git@github.com:docker/docker.git',
+            'git@bitbucket.org:atlassianlabs/atlassian-docker.git',
+            'https://github.com/docker/docker.git',
+            'http://github.com/docker/docker.git',
+        ]
+        for valid_url in valid_urls:
+            service_dict = config.load(build_config_details({
+                'validurl': {'build': valid_url},
+            }, '.', None))
+            assert service_dict[0]['build'] == valid_url
+
 
 class GetDefaultConfigFilesTestCase(unittest.TestCase):