Currently any spam detected by Akismet by non-members via API will be logged
in a separate table in the admin page.

Closes #5612

This is the git default and will help to prevent false positive matches.

Closes #12706

This reverts commit b0145d76.

The pattern in the `::reference_pattern` class method in the
ExternalIssue model does not match all valid forms of JIRA project
names. I have updated the regex to match JIRA project names with numbers
and underscores. More information on valid JIRA project names can be
found here:
https://confluence.atlassian.com/jira/changing-the-project-key-format-192534.html

* The first character must be a letter,
* All letters used in the project key must be from the Modern Roman Alphabet and upper case, and
* Only letters, numbers or the underscore character can be used.

This adds instrumentation for the instance methods of
Gitlab::Git::Repository.

This allows you to do:

    rake dev:setup BOOTSTRAP=1

and prevent dozens of letter_opener emai popups in your browser.

Since GitHub doesn’t apply these constraints to theirs wiki slug
allowing characters like `,`, `:`, `*`, etc, we need to relax our
constraints or some wiki pages will not be available after they were
imported.

For an example the Devise project have a wiki page with the following
slug: “How To: Add sign_in, sign_out, and sign_up links to your layout
template”

Added also a `Gitlab::Ci::Build::Artifacts::Metadata::ParserError`
exception class.

This reverts nesting artifacts controller in builds module.

Closes #3046

This reverts commit ae7de2f8.

ref: https://github.com/ruby/ruby/commit/238b979f1789f95262a267d8df6239806f2859cc

See https://git.io/vztMu and http://stackoverflow.com/a/17571242/223897

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

This isn't hugely useful and mostly wastes InfluxDB space. We can re-add
this whenever needed (but only once we really need it).