message: Update .travis.yml
  Make clang use it's own c++ lib
diff: @@ -22,15 +22,15 @@ addons_shortcuts:
  addons_clang39: &clang39
  apt:
  sources: [ 'ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.9' ]
  - packages: [ 'clang-3.9' ]
  + packages: [ 'clang-3.9','libc++-dev','libc++abi-dev' ]
  addons_clang40: &clang40
  apt:
  sources: [ 'ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-4.0']
  - packages: [ 'clang-4.0' ]
  + packages: [ 'clang-4.0','libc++-dev','libc++abi-dev' ]
  addons_clang50: &clang50
  apt:
  sources: [ 'ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
  - packages: [ 'clang-5.0', 'clang-tidy-5.0' ]
  + packages: [ 'clang-5.0', 'clang-tidy-5.0','libc++-dev','libc++abi-dev' ]
  addons_gcc5: &gcc5
  apt:
  sources: [ 'ubuntu-toolchain-r-test' ]
  @@ -49,20 +49,23 @@ matrix:
  - os: linux
  compiler: "clang-3.9"
  env: BUILD='Debug' CC=clang-3.9 CXX=clang++-3.9
  + CXXFLAGS="-stdlib=libc++ ${CXXFLAGS}"
  addons: *clang39
  - os: linux
  compiler: "clang-4.0"
  env: BUILD='Debug' CC=clang-4.0 CXX=clang++-4.0
  + CXXFLAGS="-stdlib=libc++ ${CXXFLAGS}"
  addons: *clang40
  - os: linux
  compiler: "clang-5.0"
  env: BUILD='Debug' CC=clang-5.0 CXX=clang++-5.0
  CLANG_TIDY=clang-tidy-5.0
  + CXXFLAGS="-stdlib=libc++ ${CXXFLAGS}"
  addons: *clang50
  - os: linux
  compiler: "clang-5.0"
  env: BUILD='Debug' CC=clang-5.0 CXX=clang++-5.0
  - CXXFLAGS="-fsanitize=address,undefined,integer -fno-sanitize-recover=all -fno-omit-frame-pointer"
  + CXXFLAGS="-stdlib=libc++ -fsanitize=address,undefined,integer -fno-sanitize-recover=all -fno-omit-frame-pointer ${CXXFLAGS}"
  LDFLAGS="-fsanitize=address,undefined,integer"
  addons: *clang50
  - os: linux
  