update travis, squash history (#265)

.travis-setup.sh

-#!/usr/bin/env bash
-
-# Before install
-
-sudo add-apt-repository -y ppa:kalakris/cmake
-if [ "$STD" = "c++11" ]; then
-    sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-    if [ "$CXX" = "clang++" ]; then
-        wget -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
-        sudo add-apt-repository -y "deb http://llvm.org/apt/precise/ llvm-toolchain-precise-3.6 main"
-    fi
-fi
-sudo apt-get update -qq
-
-# Install
-sudo apt-get install -qq cmake
-if [ "$STD" = "c++11" ] && [ "$CXX" = "g++" ]; then
-    sudo apt-get install -qq gcc-4.8 g++-4.8
-    sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 90
-    sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
-elif [ "$CXX" = "clang++" ]; then
-    sudo apt-get install -qq clang-3.6
-    sudo update-alternatives --install /usr/local/bin/clang   clang   /usr/bin/clang-3.6 90
-    sudo update-alternatives --install /usr/local/bin/clang++ clang++ /usr/bin/clang++-3.6 90
-    export PATH=/usr/local/bin:$PATH
-fi

.travis.yml

+sudo: required
+dist: trusty
 language: cpp
 
 # NOTE: The COMPILER variable is unused. It simply makes the display on
@@ -5,22 +7,17 @@ language: cpp
 matrix:
     include:
         - compiler: gcc
-          env: COMPILER=g++-4.6     STD=c++0x BUILD_TYPE=Coverage
-        - compiler: gcc
-          env: COMPILER=g++-4.6     STD=c++0x BUILD_TYPE=Debug
-        - compiler: gcc
-          env: COMPILER=g++-4.6     STD=c++0x BUILD_TYPE=Release
+          env: COMPILER=g++         STD=c++11 BUILD_TYPE=Coverage
         - compiler: gcc
-          env: COMPILER=g++-4.8     STD=c++11 BUILD_TYPE=Debug
+          env: COMPILER=g++         STD=c++11 BUILD_TYPE=Debug
         - compiler: gcc
-          env: COMPILER=g++-4.8     STD=c++11 BUILD_TYPE=Release
+          env: COMPILER=g++         STD=c++11 BUILD_TYPE=Release
         - compiler: clang
-          env: COMPILER=clang++-3.6 STD=c++11 BUILD_TYPE=Debug
+          env: COMPILER=clang++     STD=c++11 BUILD_TYPE=Debug
         - compiler: clang
-          env: COMPILER=clang++-3.6 STD=c++11 BUILD_TYPE=Release
+          env: COMPILER=clang++     STD=c++11 BUILD_TYPE=Release
 
 before_script:
-    - source .travis-setup.sh
     - mkdir build && cd build
 
 install: