adding "export QT_CMAKE_PREFIX_PATH=/usr/local/opt/qt5/lib/cmake" for qt5.2.1
adding "export QT_CMAKE_PREFIX_PATH=/usr/local/Cellar/qt5/5.2.1/lib/cmake" for qt5.2.1
Merge pull request #3142 from mpursley/master

adding "export QT_CMAKE_PREFIX_PATH=/usr/local/Cellar/qt5/5.2.1/lib/cmake" for qt5.2.1