Retry if rubygems misbehaves: it's probably just the network

.travis.yml

@@ -18,8 +18,8 @@ addons:
 bundler_args: --without test --jobs 3 --retry 3
 before_install:
   - "rm ${BUNDLE_GEMFILE}.lock"
-  - "gem update --system"
-  - "gem update bundler"
+  - "travis_retry gem update --system"
+  - "travis_retry gem update bundler"
   - "[ -f /tmp/beanstalkd-1.10/Makefile ] || (curl -L https://github.com/kr/beanstalkd/archive/v1.10.tar.gz | tar xz -C /tmp)"
   - "pushd /tmp/beanstalkd-1.10 && make && (./beanstalkd &); popd"
   - "[[ -z $encrypted_8a915ebdd931_key && -z $encrypted_8a915ebdd931_iv ]] || openssl aes-256-cbc -K $encrypted_8a915ebdd931_key -iv $encrypted_8a915ebdd931_iv -in activestorage/test/service/configurations.yml.enc -out activestorage/test/service/configurations.yml -d"