Allowing failures for PyQt5 on travis

Author: nicoddemus

.travis.yml

@@ -1,16 +1,16 @@
 language: python
 
 python:
-  - "2.7_with_system_site_packages"
-  - "3.4_with_system_site_packages"
+  - "2.7"
+  - "3.2"
 
-#virtualenv:
-#  system_site_packages: true
+virtualenv:
+  system_site_packages: true
 
 matrix:
-  exclude:
-    - python: 2.7
-      env: PYTEST_QT_FORCE_PYQT=5
+  allow_failures:
+    # unfortunately couldn't find a reliable way to test pyqt5 on travis yet
+    - env: PYTEST_VERSION=2.7.0 PYTEST_QT_FORCE_PYQT=5
 
 env:
 # - PYTEST_VERSION=2.6.4 PYTEST_QT_FORCE_PYQT=true