Fix version processing

- First 3 elements of VERSION should be integer.
- Don't get upset with version.py non-existant, e.g. for version checked
  straight out of git.

guardian/__init__.py

@@ -5,15 +5,18 @@
 from . import checks
 
 
-from .version import version as __version__
-VERSION = __version__.split(".")
-
-
-def get_version():
-    """
-    Returns shorter version (digit parts only) as string.
-    """
-    return '.'.join((str(each) for each in VERSION[:3]))
+try:
+    from .version import version as __version__
+    __version__split__ = __version__.split(".")
+    VERSION = [int(each) for each in __version__split__[:3]] + __version__split__[3:]
+
+    def get_version():
+        """
+        Returns shorter version (digit parts only) as string.
+        """
+        return '.'.join((str(each) for each in VERSION[:3]))
+except ImportError:
+    pass
 
 
 default_app_config = 'guardian.apps.GuardianConfig'