Make compose.config a proper module

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

compose/config/__init__.py

@@ -0,0 +1,10 @@
+from .config import (
+    DOCKER_CONFIG_KEYS,
+    ConfigDetails,
+    ConfigurationError,
+    find,
+    load,
+    parse_environment,
+    merge_environment,
+    get_service_name_from_net,
+)  # flake8: noqa

tests/integration/testcases.py

@@ -1,7 +1,7 @@
 from __future__ import unicode_literals
 from __future__ import absolute_import
 from compose.service import Service
-from compose.config import ServiceLoader
+from compose.config.config import ServiceLoader
 from compose.const import LABEL_PROJECT
 from compose.cli.docker_client import docker_client
 from compose.progress_stream import stream_output

tests/unit/config_test.py

@@ -4,7 +4,7 @@ import shutil
 import tempfile
 from .. import unittest
 
-from compose import config
+from compose.config import config
 
 
 def make_service_dict(name, service_dict, working_dir):