Reactivating usual build matrix

Author: nicoddemus

.travis.yml

@@ -13,10 +13,10 @@ matrix:
     - env: PYTEST_VERSION=2.7.0 PYTEST_QT_FORCE_PYQT=5
 
 env:
-# - PYTEST_VERSION=2.6.4 PYTEST_QT_FORCE_PYQT=true
-# - PYTEST_VERSION=2.6.4 PYTEST_QT_FORCE_PYQT=false
-# - PYTEST_VERSION=2.7.0 PYTEST_QT_FORCE_PYQT=true
+ - PYTEST_VERSION=2.6.4 PYTEST_QT_FORCE_PYQT=4
+ - PYTEST_VERSION=2.6.4 PYTEST_QT_FORCE_PYQT=false
  - PYTEST_VERSION=2.7.0 PYTEST_QT_FORCE_PYQT=4
+ - PYTEST_VERSION=2.7.0 PYTEST_QT_FORCE_PYQT=false
  - PYTEST_VERSION=2.7.0 PYTEST_QT_FORCE_PYQT=5
 
 install: