Merge pull request #60 from niklas88/gcc-5-travis

Travis: Install and use GCC 5

.travis.yml

@@ -2,16 +2,22 @@ language: c++
 sudo: false
 dist: trusty
 
-compiler:
-  - gcc
 
 addons:
   apt:
+    sources:
+      - ubuntu-toolchain-r-test
     packages:
+      - gcc-5
+      - g++-5
       - libsparsehash-dev
       - cmake
 
+compiler:
+  - gcc-5
+
 before_script:
+  - $CXX --version
   - mkdir build
   - cd build
   - cmake ..