Give up on XCode 6.4 on Travis

Author: robertodr

.travis.yml

@@ -212,14 +212,6 @@ matrix:
     compiler: gcc
     addons: *9
     env: CXX_COMPILER='g++-5' C_COMPILER='gcc-5' Fortran_COMPILER='gfortran-5' BUILD_TYPE='debug'
-  - os: osx
-    osx_image: xcode6.4
-    compiler: clang
-    env: CXX_COMPILER='clang++' C_COMPILER='clang' Fortran_COMPILER='gfortran' BUILD_TYPE='debug'
-  - os: osx
-    osx_image: xcode6.4
-    compiler: clang
-    env: CXX_COMPILER='clang++' C_COMPILER='clang' Fortran_COMPILER='gfortran' BUILD_TYPE='release'
   - os: osx
     osx_image: xcode7
     compiler: clang
@@ -228,14 +220,6 @@ matrix:
     osx_image: xcode7
     compiler: clang
     env: CXX_COMPILER='clang++' C_COMPILER='clang' Fortran_COMPILER='gfortran' BUILD_TYPE='release'
-  - os: osx
-    osx_image: xcode6.4
-    compiler: gcc
-    env: CXX_COMPILER='g++-5' C_COMPILER='gcc-5' Fortran_COMPILER='gfortran' BUILD_TYPE='debug'
-  - os: osx
-    osx_image: xcode6.4
-    compiler: gcc
-    env: CXX_COMPILER='g++-5' C_COMPILER='gcc-5' Fortran_COMPILER='gfortran' BUILD_TYPE='release'
   - os: osx
     osx_image: xcode7
     compiler: gcc