Updated .travis.yml to support gcc 4.7
+language: cpp
+compiler: g++
+
+before_install:
+- sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+- sudo apt-get update -qq
+
+install:
+- sudo apt-get install -qq g++-4.7
+- export CXX="g++-4.7"
+
git:
submodules: false
before_script:
