cmakeがうまく入らなかった

↓を参考に再挑戦
travis-ci/travis-ci#4631

----------------- MD5 Hash Values -----------------
TheolizerDriver  : a434fbea44a54357fd8118797cc3d7ff
TheolizerLibrary : af0fc1e5a034992eecb3811484d87d4a
Library's Header : 746959b760b766a8c6dcd23aa380b2c7

.travis.yml

@@ -18,17 +18,15 @@ addons:
     sources:
     - ubuntu-toolchain-r-test
     packages:
-    - g++-4.9
-    - g++-5.0
-    - g++-5.3
-    - g++-5.4
+    - g++-5
 
 addons:
   apt:
     sources:
     - george-edison55-precise-backports
     packages:
     - cmake
+    - cmake-data
 
 language: cpp