www/gitlab-workhorse: Update from 0.7.1 to 0.7.5

v0.7.5

• Add the capability to inject git diff output as HTTP response bodies

v0.7.4

• Pass a timestamp when forwarding requests to Rails. Hopefully this will give us insight into Unicorn queueing behavior.

v0.7.3

• Revert 'buffer Git HTTP responses'. Set default listen socket permissions to world read/writeable.

v0.7.2 DO NOT USE

• Integrate with GOPATH during development (remove relative imports etc.). Buffer Git HTTP responses so that we may return an error if the local command fails early. Update: the 'buffer Git HTTP responses' change in 0.7.2 is BAD, it breaks shallow Git clone. Don't use 0.7.2!

Approved by: swills (mentor)