Non-special API requests were getting special treatment, which
resulted in 500 errors. This change avoids the special treatment and
adds tests that assert that regular API requests should be left alone
by gitlab-workhorse.

Prevent archive zombies

Interrupted archive downloads were creating zombies, see
https://gitlab.com/gitlab-org/gitlab-workhorse/issues/9

See merge request !25

Episode V: The Archive Zombies Strike Back

The -relativeURL option existed for a while but was never included in
an official release.

Do not show error pages in development mode



See merge request !24

Hat tip to Stan Hu:
https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/21

Fix routing for encoded slashes

It seems URI.Path gets unescaped. URI.EscapePath() contains the `%2F` we want.

Also see https://gitlab.com/gitlab-org/gitlab-ce/issues/4124

See merge request !23

Improve relative URL support

This also removes the -relativeURLRoot setting introduced in 0.5.0.

See merge request !19

The missing trailing / on example.com/gitlab was making us throw a
404.

Make GitLab Workhorse passthrough to Unicorn

It works :)


See merge request !12

Use Go 1.5.2 for tests



See merge request !15