Use travis_retry for commands which use the internet

.travis.yml

@@ -9,11 +9,11 @@ python:
   - "3.4"
   - "pypy"
 before_install:
-  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then sudo apt-get update -qq; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then travis_retry sudo apt-get update -qq; fi
 install:
-  - pip install pyinotify
-  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then sudo apt-get install -qq python-gamin; cp /usr/share/pyshared/gamin.py /usr/lib/pyshared/python2.7/_gamin.so $VIRTUAL_ENV/lib/python2.7/site-packages/; fi
-  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then cd ..; pip install -q coveralls; cd -; fi
+  - travis_retry pip install pyinotify
+  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then travis_retry sudo apt-get install -qq python-gamin; cp /usr/share/pyshared/gamin.py /usr/lib/pyshared/python2.7/_gamin.so $VIRTUAL_ENV/lib/python2.7/site-packages/; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then cd ..; travis_retry pip install -q coveralls; cd -; fi
 script:
   - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then coverage run --rcfile=.travis_coveragerc setup.py test; else python setup.py test; fi
 # test installation