Preparing 1.5.1 steps 6/16

4. update setup.py classifiers
5. clean *.orig, *.rej, .#* files
6. python setup.py clean --all

Author: techtonik

setup.py

@@ -138,6 +138,7 @@ def main():
                        'Operating System :: Microsoft :: Windows',
                        'Operating System :: POSIX',
                        'Programming Language :: Python',
+                       'Programming Language :: Python :: 2 :: Only',
                        'Topic :: Communications :: Email',
                        'Topic :: Office/Business',
                        'Topic :: Software Development :: Bug Tracking',