Version updates

This change updates dependency versions.  This update includes an
update to Rubocop necessitating changes to the source code.

Merge 69986486-buildpack-debug to master

[Completes #69986486]

Merge 69089318-download-cache-redirects to master

[Completes #69089318]

Merge 66409480-recover-from-dns-lookup-failure to 2.0.x

[Completes #66409480]

Merge 63747966-insight-improvements to master

[Completes #63747966]

Upgrade Ruby

This change upgrades the required version of Ruby to 1.9.3-p484 due to
a security vulnerability in 1.9.3-p448.

[#61839004]