Fix QT install.

Allows sub-version so we can do QT5.5.1 (Webkit) and QT5.6 (Webengine) at a later date.

travis/install-qt.sh

@@ -1,15 +1,9 @@
 #!/bin/bash
 echo "QT=>" "$QT" "<="
-if [ "$QT" = "qt5" ]
+#!/bin/bash
+if [ "$QT_VER" = "5.5.1" ]
 then
-  pwd
-  workdir=`pwd`
-  echo ${workdir}
-  cd $( brew --prefix )
-  pwd
-  # Select QT 5.5.1
-  git checkout fb64f6cd91ff Library/Formula/qt5.rb
-  cd ${workdir}
-  pwd
+ brew install https://raw.githubusercontent.com/Homebrew/homebrew/fb64f6cd91ff19d9c651b7851a74808bde6bc60f/Library/Formula/qt5.rb
+else
+ brew install $QT
 fi
-brew install $QT