Add retry option of travis and bundler
Created by: Razer6
What does this MR do?
This PR adds the retry option for bundler and travis. Bundler now tries 3 times to install the bundle. If the command fails Travis tries the command again.
Are there points in the code the reviewer needs to double check?
These options are documented here
Why was this MR needed?
Currently often times out when installing gems. This makes Travis pretty useless.