Set up travis to run python 3.4 across code as well. Do not fail the

build if 3.4 tests fail.

This is prep for applying patches in http://issues.roundup-tracker.org/issue2550960
This is an implementation of directions in:

 https://sourceforge.net/p/roundup/mailman/message/36372507/

sort of monkey see monkey do.

Author: rouilj

.travis.yml

@@ -1,6 +1,11 @@
 language: python
 python:
   - 2.7
+  - 3.4
+
+matrix:
+  allow_failures:
+    - python: 3.4
 
 sudo: false