NOISSUE Add more qt versions to travis

5.0, 5.1 and 5.2 are currently marked as "allow failure". If they can be made
to pass they should be removed from this list, if not they should be removed
entirely.

.travis.yml

@@ -13,13 +13,34 @@ os:
  - linux
 # - osx
 env:
- - QT_VERSION=5.5.1 # latest stable
-# - QT_VERSION=5.5-beta # latest
+ - QT_VERSION=5.0.2
+ - QT_VERSION=5.1.1
+ - QT_VERSION=5.2.1
+ - QT_VERSION=5.3.2
+ - QT_VERSION=5.4.2
+ - QT_VERSION=5.5.1 # latest
 matrix:
   exclude:
     # only use clang on OS X
     - os: osx
       compiler: gcc
+    # only use the qt available from homebrew
+    - os: osx
+      env: QT_VERSION=5.0.2
+    - os: osx
+      env: QT_VERSION=5.1.1
+    - os: osx
+      env: QT_VERSION=5.2.1
+    - os: osx
+      env: QT_VERSION=5.3.2
+    - os: osx
+      env: QT_VERSION=5.4.2
+    - os: osx
+      env: QT_VERSION=5.5.1
+  allow_failures:
+    - env: QT_VERSION=5.0.2
+    - env: QT_VERSION=5.1.1
+    - env: QT_VERSION=5.2.1
 
 # Install dependencies
 install: