build: add Python 3 support to build files

Author: Steve Canny

.travis.yml

@@ -1,5 +1,7 @@
 language: python
 python:
+  - "3.4"
+  - "3.3"
   - "2.7"
   - "2.6"
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors

setup.py

@@ -39,6 +39,9 @@
     'Programming Language :: Python :: 2',
     'Programming Language :: Python :: 2.6',
     'Programming Language :: Python :: 2.7',
+    'Programming Language :: Python :: 3',
+    'Programming Language :: Python :: 3.3',
+    'Programming Language :: Python :: 3.4',
     'Topic :: Office/Business :: Office Suites',
     'Topic :: Software Development :: Libraries'
 ]