Missing exceptions used by BuildManager.package, as pointed by pzanoni.

===================================================================
--- BuildManager/package.py     (revisão 257807)
+++ BuildManager/package.py     (revisão 257808)
@@ -6,6 +6,9 @@
 import os
 import re

+class BuildManagerFileError(Error): pass
+class BuildManagerPackageError(Error): pass
+
 try:
     import rpm
 except ImportError: