Force Travis CI to use GCC 4.8

Author: dahlia

.travis.yml

@@ -13,8 +13,9 @@ before_install:
 - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
 - sudo apt-get update -qq
 install:
-- sudo apt-get install -qq g++-4.8 libstdc++-4.8-dev
-- export CC="gcc-4.8" CXX="g++-4.8"
+- sudo apt-get install -qq gcc-4.8 g++-4.8 libstdc++-4.8-dev
+- sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 20
+- sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 20
 - pip install -e . "Werkzeug >= 0.9" coverage coveralls
 script:
 - coverage run --source sass,sassc,sassutils setup.py test