Fix dev user seed: multiple ID was used twice.
Use blob local instead of instance.
Disable / hide MR edit blob button if cannot edit.
Add tests for tree edit routes

Critical because of possible confusion between /:id/preview
and /:id for a path that ends in preview.
Remove unused has_gitlab_shell3? method
Update gemnasium-gitlab-service to version 0.2.3
Update the Omnibus package in Dockerfile

From 7.5.2 to 7.5.3.

Signed-off-by: kfei <kfei@kfei.net>
Reduce the size of Docker image

1) Add `--no-install-recommends` option to `apt-get install`, this
   avoids lots of (~30MB) unnecessary packages.
2) Add `ca-certificates` package for `wget` fetching stuffs from Amazon
   S3.
3) There is no need to run `apt-get clean` for an image derived from
   official Ubuntu since they already cleaned (see also:
   http://goo.gl/B2SQRB) all the garbages produced by `apt-get`.

Signed-off-by: kfei <kfei@kfei.net>
Added link to the configuration sample for OmniAuth providers when using Omnibus.
Merge branch 'omniauth-config-sample-link' into 'master'

Add link to OmniAuth config sample for Omnibus

Added a link to the OmniAuth config sample for Omnibus installations.

See merge request !1335
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Merge pull request #8455 from kfei/docker/update-omnibus-package

Update the Omnibus package in Dockerfile
Merge pull request #8458 from kfei/docker/reduce-image-size

Reduce the size of Docker image
Merge pull request #7978 from cirosantilli/edit-preview-route-test

Add tests for tree edit routes
Merge pull request #7894 from cirosantilli/fix-dev-user-seed

Fix dev user seed: ID was used twice.
Merge pull request #8422 from gemnasium/update_gemnasiumm-gitlab-service

Update gemnasium-gitlab-service to version 0.2.3
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Merge pull request #7886 from cirosantilli/disable-blob-edit-mr

Disable / hide MR edit blob button if cannot edit.
Merge pull request #7882 from cirosantilli/blob-instance-to-local

Use blob local instead of instance.
Merge branch 'master' of github.com:gitlabhq/gitlabhq