Use dist Trusty

Author: mbinna

.travis.yml

@@ -1,40 +1,15 @@
-# Source: https://github.com/boostorg/hana/blob/master/.travis.yml
-
+dist: trusty
 language: cpp
-sudo: true
 compiler:
     - clang
     - gcc
 addons:
     apt:
         sources:
             - ubuntu-toolchain-r-test
-cache:
-    directories:
-        - ${TRAVIS_BUILD_DIR}/deps/cmake
-        - ${TRAVIS_BUILD_DIR}/deps/protobuf
-install:
-    - DEPS_DIR="${TRAVIS_BUILD_DIR}/deps"
-    - mkdir -p "${DEPS_DIR}" && cd "${DEPS_DIR}"
-
-    # Install a recent version of CMake
-    - |
-        CMAKE_URL="https://cmake.org/files/v3.7/cmake-3.7.2-Linux-x86_64.tar.gz"
-        mkdir cmake
-        travis_retry wget --no-check-certificate --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C cmake
-        export PATH=${DEPS_DIR}/cmake/bin:${PATH}
-
-    # Install a recent version of the Protobuf
-    - |
-        PROTOBUF_URL="https://github.com/google/protobuf/releases/download/v3.2.0/protobuf-cpp-3.2.0.tar.gz"
-        mkdir protobuf
-        travis_retry wget --no-check-certificate --quiet -O - ${PROTOBUF_URL} | tar --strip-components=1 -xz -C protobuf
-        cd protobuf
-        ./configure --prefix=/usr
-        make
-        make install
-before_script:
-    - cd "${TRAVIS_BUILD_DIR}"
+        package:
+            - cmake
+            - protobuf
 script:
     - mkdir build
     - cd build