Clean current bundler environment before shelling out to bundler commands
Now that we are running bundler commands with a clean env, this is no longer needed
Increase aruba timeout because installing gems might take a lot of time
Wrap one missing `bundle exec` call with a clean environment
Install gems using 4 jobs to make things run faster
Install bundler only when needed in order to speed up the build
Disable rvm gemsets on travis as an attempt to make the build run faster
Merge pull request #337 from Helabs/fr-fix-da-build

Fix da build