Handle bundle install failures with travis_retry
Handle bundle install failures with travis_retry

Resolve timeout issues when running bundle install on Travis by using
the `travis_retry` command. It will retry the install command up to 3
times.

LimeBlast/high_voltage,zBMNForks/high_voltage,bentoncreation/high_voltage,thoughtbot/high_voltage,webdev1001/high_voltage,thoughtbot/high_voltage,bentoncreation/high_voltage,LimeBlast/high_voltage