Ensure that Expression is available in top level boolean module

Author: pombredanne

boolean/__init__.py

@@ -13,6 +13,8 @@
 from __future__ import absolute_import
 
 from boolean.boolean import BooleanAlgebra
+
+from boolean.boolean import Expression
 from boolean.boolean import Symbol
 
 from boolean.boolean import AND

setup.py

@@ -27,7 +27,7 @@
 
 setup(
     name='boolean.py',
-    version='3.0.dev1',
+    version='3.0.dev2',
     license='revised BSD license',
     description='Define boolean algebras, create and parse boolean expressions and create custom boolean DSL.',
     long_description=long_desc,