move bundler install lines in travis
move bundler install lines in travis

The offending Bundler version isn't installed by the time
`before_install` runs.

Signed-off-by: Tyler Schultz <6b7a73f4f7cffc2a148becd12890940350ddfa95@pivotal.io>
Signed-off-by: Christopher Brown <eb0819782e2e967e3d4f4d71eab0c647ed2659cf@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh