[Documentation] simplify 6.0 to 7.2 upgrade guide

Comment and close

Fixes #1240

See merge request !1055

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

Show milestone percentage in detail page, fixes #485

#### What does this MR do?

This MR adds the percentage count also to the milestone detail page.

##### Why was this MR needed?

Currently, this is only shown in the overview list.

##### What are the relevant issue numbers?

#485

###### Screenshots

![Screenshot 2014-08-17 21.14.27](https://gitlab.com/uploads/razer6/gitlab-ce/27e6f20bf2/Screenshot_2014-08-17_21.14.27.png)

See merge request !170

Added Spinach tests for search issues by issue-description

Added Spinach tests for 'search issues by description' feature which was added to Changelog 7.1 for feature "Filter by description on Issues#index page"

See merge request !172

Removed redundant spans

Moved padding from li to a in dashboard groups / projects listing

Remove duplicated setupNoteForm method

Update redcarpet gem

Awesome keyboard shortcuts for GitLab

[Documentation] add prepare for update details to 5.1 to 6.0 guide

Modify empty project instructions to use double quotes for commit mesage

Fixes http://feedback.gitlab.com/forums/176466-general/suggestions/6006904-modify-instruction-to-use-double-quotes-for-windo

See merge request !179

helps detect and correct issues that may occur during upgrade before
they have already occurred. easier to address issues before you start
upgrade process.

http://feedback.gitlab.com/forums/176466-general/suggestions/6006904-modify-instruction-to-use-double-quotes-for-windo

Feature ldap tests

Move specs to proper places. Relates to #154

This is already mergeable, will continue in a new branch for additions & refactorings.

See merge request !1053

Avoid ldap.allow_username_or_email_login issues

See merge request !1016

make CI build faster

Comment typo.

Comment typo.

Use svg instead of png to get better image quality

Fix Atom feed for comments

Return extra empty line in blob render

Updated the spring gem and fixed the guard file

Enable highlighting for blame

This method existed to allow LDAP users to take over existing GitLab
accounts if the part before the '@' of their LDAP email attribute
matched the username of an existing GitLab user. I propose to disable
this behavior in order to prevent unintended GitLab account takeovers.

After this change it is still possible to take over an existing GitLab
account with your LDAP credentials, as long as the GitLab account email
address matches the LDAP user email address.

The example LDAP configuration in gitlab.yml enables the
allow_username_or_email_login setting. Because the effect of this
setting is somewhat counterintuitive, I propose we make 'false' the
example default. The settings initializer already sets this setting to
'false'.

Don't allow edit of system notes

Fix #1412

See merge request !1052