Cleanup.

script/ci_install.sh

-#!/bin/bash
-
-set -ex
-
-BUILD_DIR=${TRAVIS_BUILD_DIR}
-
-mkdir -p "${DEPENDENCY_DIR}" && cd "${DEPENDENCY_DIR}"
-
-
-# --- CMake
-CMAKE_INSTALLER=install-cmake.sh
-
-if [[ ! -f ${CMAKE_INSTALLER} ]]
-then
-    curl -sSL https://cmake.org/files/v3.8/cmake-3.8.2-Linux-x86_64.sh -o ${CMAKE_INSTALLER}
-    chmod +x ${CMAKE_INSTALLER}
-fi
-
-sudo ./${CMAKE_INSTALLER} --prefix=/usr/local --skip-license
-cmake --version
-
-
-cd ${DEPENDENCY_DIR}
-
-
-# --- LibC++
-if [[ "${CXX}" = clang* ]]
-then
-    if [[ ! -d "${DEPENDENCY_DIR}/llvm-source" ]]
-    then
-        LLVM_RELEASE=release_50
-        git clone --depth=1 -b ${LLVM_RELEASE} https://github.com/llvm-mirror/llvm.git llvm-source
-        git clone --depth=1 -b ${LLVM_RELEASE} https://github.com/llvm-mirror/libcxx.git llvm-source/projects/libcxx
-        git clone --depth=1 -b ${LLVM_RELEASE} https://github.com/llvm-mirror/libcxxabi.git llvm-source/projects/libcxxabi
-    fi
-
-    mkdir -p build && cd build
-
-    cmake -DCMAKE_C_COMPILER=${CC} \
-        -DCMAKE_CXX_COMPILER=${CXX} \
-        -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-        -DCMAKE_INSTALL_PREFIX=/usr \
-        -DLIBCXX_ABI_UNSTABLE=ON \
-        ../llvm-source
-    make cxx -j4
-
-    sudo make install-cxxabi install-cxx
-fi
-
-
-cd ${BUILD_DIR}