Fix inport errors and maintain compatibility with python 3.5x)

package_manager/bpkg/__init__.py

@@ -1,11 +1,18 @@
-from .exceptions import (
-        BpkgException,
-        InstallException,
-        DownloadException,
-        BadRepository,
-        )
-from .types import (
+import logging
+
+log = logging.getLogger(__name__)
+
+if 'bpy' in locals():
+    import importlib
+
+    log.debug("Reloading %s", __name__)
+    exceptions = importlib.reload(exceptions)
+    Package = importlib.reload(types.Package)
+    Repository = importlib.reload(types.Repository)
+
+else:
+    from . import exceptions
+    from .types import (
         Package,
         Repository,
         )
-