reset travis file

.travis.yml

 language: cpp
 
-
-matrix:
-  fast_finish: true
-  include:
-    - os: linux
-      env: TOOLSET=clang-3.4
-      addons: &clang34
-        apt:
-          packages:
-            - clang-3.4
-            - libstdc++-5-dev
-            - valgrind
-            - gdb
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.4
-
-    - os: linux
-      env: TOOLSET=clang-3.5
-      addons: &clang35
-        apt:
-          packages:
-            - clang-3.5
-            - libstdc++-5-dev
-            - valgrind
-            - gdb
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.5
-
-    - os: linux
-      env: TOOLSET=clang-3.6
-      addons: &clang36
-        apt:
-          packages:
-            - clang-3.6
-            - libstdc++-5-dev
-            - valgrind
-            - gdb
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.6
-
-    - os: linux
-      env: TOOLSET=clang-3.7
-      addons: &clang37
-        apt:
-          packages:
-            - clang-3.7
-            - libstdc++-5-dev
-            - valgrind
-            - gdb
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise
-
-    - os: linux
-      env: TOOLSET=gcc-5
-      addons: &gcc5
-        apt:
-          packages:
-            - g++-5
-            - libstdc++-5-dev
-            - valgrind
-            - gdb
-          sources:
-            - ubuntu-toolchain-r-test
-
-
-#compiler:
-#  - gcc
+compiler:
+  - gcc
 
 before_install:
-#  - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-#  - sudo apt-get update -qq
-#  - if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.9; fi
-#  - if [ "$CXX" = "g++" ]; then export CXX="g++-4.9" CC="gcc-4.9"; fi
+  - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
+  - sudo apt-get update -qq
+  - if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.9; fi
+  - if [ "$CXX" = "g++" ]; then export CXX="g++-4.9" CC="gcc-4.9"; fi
   - sudo pip install cpp-coveralls pyyaml
   - sudo apt-get install valgrind
   - sudo pip install codecov