rails_helper.rb's only logic was to require
spec_helper.rb.

User images and videos will get proxied through
the Camo server in order to keep malicious
sites from collecting the IP address of users.

Using the sed script from
https://gitlab.com/gitlab-org/gitlab-ce/issues/59758

- use predefined factories when creating
projects with services
- remove unnecessary arguments

If we put the emoji filter before the reference filters, each emoji will
have a wrapper element that prevents the reference filter from detecting
the presence of the emoji.

As the emoji filter now runs after the reference filters, references
must contain a literal emoji, not the GitLab Flavored Markdown
versions (:100`, for example).

A weird side-effect is that if you have a label with the 100 emoji, and
a label named 💯, then trying to reference the latter will work (link
to the correct label), but will render with the 100 emoji. I'm
comfortable with that edge case, I think.

[master] XSS in markdown following unrecognized HTML element

Closes #2732

See merge request gitlab/gitlabhq!2599