Also fix a few places where page_404 should be render_404.

In this version we will support only relative paths in artifacts
metadata. Support for absolute paths will be introduced later.

Artifacts metadata field will be used to store a filename of gzipped
file containing metadata definition for given artifacts archive.

`artifacts?` method checks if artifacts archive is available.

This implementation makes it possible to browse artifacts, it
depends on artifacts metadata.

This reverts nesting artifacts controller in builds module.

Closes #3046

This is intended to prevent the user from creating new objects while the
transaction that removes them is being run, resulting in objects with
nil authors which can then not be edited.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/7117

Closes #5851

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Sorting by "id" has the same effect as sorting by created_at while
performing far better and without the need of an extra index (in case
one wanted to speed up sorting by "created_at").

Sorting by "Recently updated" still uses the physical "updated_at"
column as there's no way to use the "id" column for this instead.

Using the fuzzy filter, develop "file finder" feature.
- feedback(http://feedback.gitlab.com/forums/176466-general/suggestions/4987909-add-file-finder-fuzzy-input-in-files-tab-to-ju )
- fuzzy filter(https://github.com/jeancroy/fuzzaldrin-plus)
- shortcuts(when "t" was hitted at tree view, go to 'file find' page and 'esc' is to go back)
- depends on gitlab_git 7.2.22

InfluxDB over UDP doesn't use authentication, thus there's no need for
these settings.

Get "Merge when build succeeds" to work when commits were pushed to MR target branch while builds were running