message: Remove clang from travis compilers
  It's not all that useful, since we cover clang by compiling on osx anyway.
diff: @@ -19,14 +19,6 @@ env:
  - CASHER_TIME_OUT=1000
  addons_shortcuts:
  - addons_clang39: &clang39
  - apt:
  - sources: [ 'ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.9' ]
  - packages: [ 'clang-3.9' ]
  - addons_clang40: &clang40
  - apt:
  - sources: [ 'ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-4.0']
  - packages: [ 'clang-4.0' ]
  addons_clang50: &clang50
  apt:
  sources: [ 'ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
  @@ -54,11 +46,11 @@ matrix:
  # compiler: "clang-4.0"
  # env: CLANG_VERSION=4.0 BUILD='Debug' CC=clang-4.0 CXX=clang++-4.0 LIBCXX=On
  # addons: *clang40
  - - os: linux
  - compiler: "clang-5.0"
  - env: CLANG_VERSION=5.0 BUILD='Debug' CC=clang-5.0 CXX=clang++-5.0 LIBCXX=On
  - CLANG_TIDY=clang-tidy-5.0
  - addons: *clang50
  +# - os: linux
  +# compiler: "clang-5.0"
  +# env: CLANG_VERSION=5.0 BUILD='Debug' CC=clang-5.0 CXX=clang++-5.0 LIBCXX=On
  +# CLANG_TIDY=clang-tidy-5.0
  +# addons: *clang50
  # - os: linux
  # compiler: "clang-5.0"
  # env: CLANG_VERSION=5.0 BUILD='Debug' CC=clang-5.0 CXX=clang++-5.0 LIBCXX=On
  