travis gcc+4.9

Author: rusty1s

.coveragerc

@@ -2,3 +2,4 @@
 exclude_lines =
     pragma: no cover
     cuda
+    backward

.travis.yml

@@ -6,16 +6,6 @@ matrix:
     - python: 2.7
     - python: 3.5
     - python: 3.6
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - gcc-4.9
-      - g++-4.9
-before_install:
-  - export CC="gcc-4.9"
-  - export CXX="g++-4.9"
 install:
   - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then pip install http://download.pytorch.org/whl/cpu/torch-0.4.1-cp27-cp27mu-linux_x86_64.whl; fi
   - if [[ $TRAVIS_PYTHON_VERSION == 3.5 ]]; then pip install  http://download.pytorch.org/whl/cpu/torch-0.4.1-cp35-cp35m-linux_x86_64.whl; fi