Add apiCiLongPolling option to use a new redis queueing mechanism

See merge request !128

Rename gitlab_workhorse_builds_register_handler_hits to gitlab_workhorse_builds_register_handler_requests

Update Go used for testing to 1.6.4 1.7.5 and add 1.8.0

See merge request !135

Redis-Awareness

Closes #85

See merge request !112

Don't assume /vendor passes gofmt

Closes #108

See merge request !132

This was true when we used Godep, no longer true with govendor.

Use gitaly-proto 0.3.0 (new import path)

See merge request !130

No changes besides the import path

Prevent writing the receive-pack response to early

See merge request !123

Use govendor

Closes #100

See merge request !126