Add "Confirm user" button to admin page

### What does this MR do?

This MR adds a "Confirm user" to the admin user page.

### Why was this MR needed?

There is no way for an admin to force a user confirmation. Some users create users in the API and then don't have a way to force the user into a confirmed state.

Originally, I attempted to add a link to allow the admin to resend a confirmation e-mail. But that may not be helpful because a user can be in the unconfirmed state with no `unconfirmed_email` set.

### Screenshot

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/0571b1e27597289b760a72948ba869e5/image.png)

### What are the relevant issue numbers?

* Closes #2116
* Closes https://github.com/gitlabhq/gitlabhq/issues/9502

See merge request !1067

Update docs for Ruby MRI 2.1 requirement

Addresses #2135 

See merge request !1089

Closes #2116
Closes https://github.com/gitlabhq/gitlabhq/issues/9502

Update the Semaphore badge to the shield badge type

**Why is this needed?**
It just does look better in the Readme :-)

See merge request !1092

**Why is this needed?**
It just does look better in the Readme :-)
Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

updated restore docs wrt backup location [ci skip]

Made sure to point out that the restore location can be overwritten by
an entry in the config.

See merge request !1030

Fix the `inline_theme` option for the Rouge formatter



See merge request !1083

Update merge request text to reflect editability of source/target branch

Screenshot 1 (source branch deleted):

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/81dfbc4c790a1bb047d60cd4699bb71f/image.png)

Screenshot 2 (target branch deleted):

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/acec96c12d40175301ce4d4405137348/image.png)

Closes #2134

See merge request !1085

Added new doc about adding users and members

Added new doc in workflow about how to add users and members and I also linked it to "permissions".

See merge request !1916

Closes #2134

Bump redis-store to 1.1.6 and remove redis-store-fix-expiry

According to this https://github.com/redis-store/redis-store/compare/v1.1.4...v1.1.6 and my manual tests the monkey patch for redis-store is no longer required

/cc @jacobvosmaer @rspeicher 


See merge request !1081

Re-annotate models

Make `code` elements in links display as such

When a link consisted only of an inline code block -- ```[`like this`](https://google.com/)``` -- it was hard to tell that it was even a link.

Before:

> ![Screen_Shot_2015-07-31_at_5.45.06_PM](https://gitlab.com/gitlab-org/gitlab-ce/uploads/eda0a0630024d461c8de151d06e9f4db/Screen_Shot_2015-07-31_at_5.45.06_PM.png)

After:

> ![Screen_Shot_2015-07-31_at_5.43.15_PM](https://gitlab.com/gitlab-org/gitlab-ce/uploads/9542c49cfb4d43c015d464ef0ba0440f/Screen_Shot_2015-07-31_at_5.43.15_PM.png)


See merge request !1082

Also adds some minor padding to inline `code` elements.

Add ability to manage user email addresses via the API.

Addresses internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2181

See merge request !1066

New doc about creating a Merge Request in GitLab Basics

Added new doc about creating a new branch.

See merge request !1917

Mention group and project names in flash messages upon create, update and delete.

Mention group and project names in flash messages upon create, update and delete. I also changed some wording inconsistency.

**Before**

![project_created](https://gitlab.com/axil/gitlab-ce/uploads/b91b92e46b08d6c566acee8d88fccff1/project_created.png)

**After**

![project_created_after](https://gitlab.com/axil/gitlab-ce/uploads/56db5125f2769386c43cf9e2f175a54d/project_created_after.png)

See merge request !1070

Add specific ability for managing group members

To be used for https://dev.gitlab.org/gitlab/gitlab-ee/issues/290 (Internal issue)

See merge request !1059

Fix multi-line syntax highlighting

### What does this MR do?

This MR fixes multi-line syntax highlighting in the code views. HTML span elements only apply to a single line, and in the case of multi-line comments, the highlighting was dropped as a result. Ensure that each line has
the proper styling to fix this.

### Why was this MR needed?

The current styling was broken for a while.

### Screenshots

Before:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/bbcb61760ab04a010aabc40942a2c0ba/image.png)

After:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/48f61c91b6fdd9c99cd7f3d214853141/image.png)

### What are the relevant issue numbers?

Closes #1577
Closes #1495

See merge request !1079