move Versionning class

compress/versioning/__init__.py

+class VersioningBase(object):
+    def get_version(self, source_files):
+        raise NotImplementedError
+
+    def needs_update(self, output_file, source_files, version):
+        raise NotImplementedError
+
+
+class VersioningError(Exception):
+    """This exception is raised when version creation fails"""
+    pass

compress/versioning/base.py

-class VersioningBase(object):
-    def get_version(self, source_files):
-        raise NotImplementedError
-
-    def needs_update(self, output_file, source_files, version):
-        raise NotImplementedError
-
-
-class VersioningError(Exception):
-    """This exception is raised when version creation fails"""
-    pass

compress/versioning/git/__init__.py

 from compress.conf import settings
 from compress.utils import get_output_filename, get_hexdigest, compress_source
-from compress.versioning.base import VersioningBase, VersioningError
+from compress.versioning import VersioningBase, VersioningError
 
 try:
     import git

compress/versioning/hash/__init__.py

@@ -3,7 +3,7 @@ from hashlib import md5, sha1
 
 from compress.conf import settings
 from compress.utils import concat, get_output_filename
-from compress.versioning.base import VersioningBase
+from compress.versioning import VersioningBase
 
 
 class HashVersioningBase(VersioningBase):

compress/versioning/mtime/__init__.py

 import os
 
 from compress.utils import get_output_filename, compress_source, compress_root
-from compress.versioning.base import VersioningBase
+from compress.versioning import VersioningBase
 
 
 class MTimeVersioning(VersioningBase):