Make builds for QT 4 only.

This makes build for only QT 4 and not QT 5. Changes done after
Travis CI moved to container based infrastructure.

(refer issue #2)

.travis.yml

@@ -3,15 +3,11 @@ language: cpp
 before_install:
   - sudo add-apt-repository --yes ppa:ubuntu-sdk-team/ppa
   - sudo apt-get update -qq
-  - sudo apt-get install -qq g++ qt4-qmake libqt4-dev qt5-qmake qtbase5-dev
+  - sudo apt-get install -qq g++ qt4-qmake libqt4-dev 
 
 script: 
-  - qmake -qt=qt4 -v
-  - qmake -qt=qt4
+  - qmake -v
+  - qmake 
   - make
   - make -k check
   - make clean
-  - qmake -qt=qt5 -v
-  - qmake -qt=qt5
-  - make
-  - make -k check