Also update repo restorer to use project wiki method.

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

Added "wiki" section and removed "repository"

This reverts commit 4cc85a58, reversing
changes made to 90ae445b.
Signed-off-by: NRémy Coutable <remy@rymai.me>

This caches the output of Repository#exists? in Redis while making sure
it's flushed properly when creating new repositories, deleting them,
etc.

For the ProjectWiki tests to work I had to make ProjectWiki#create_repo!
public as testing private methods in RSpec is a bit of a pain.

The "default_branch" argument is never used and the "project" argument
isn't optional.

Closes #3026

**What does this do?**
It makes sure that when you create a wiki page via the web interface, the
extention is .md instead of .markdown

**Why is this needed?**
When you're using Gollum locally, it will create pages with the .md extention.
Also .md is the best known extention for markdown. This fix will make sure that
if you're using gollum or the webinterface, the extention will be the same.

**What issues does this fix?**
Fixes https://github.com/gitlabhq/gitlabhq/issues/5204Signed-off-by: NJeroen van Baarsen <jeroenvanbaarsen@gmail.com>

Closes #1263, #431

Signed-off-by: NJeroen van Baarsen <jeroenvanbaarsen@gmail.com>

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

extension to https://github.com/gitlabhq/gitlabhq/pull/7568

From #6168.

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

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

Detect if submodule is hosted on this GitLab server, gitlab.com or github.com.
Hash links directly to commit in repo.

Most of these are comments but a few are strings for users.

Might be an idea to run this from time to time:
https://github.com/lyda/misspell-check

It runs mostly clean now.