merge request close message moved and merge request now refered by `!`.
Fixes#4161

See merge request !2387
Block the reported user before destroying the record
This is intended to prevent the user from creating new objects while the
transaction that removes them is being run, resulting in objects with
nil authors which can then not be edited.
See https://gitlab.com/gitlab-org/gitlab-ce/issues/7117
See merge request !2402
Make sure time_ago_with_tooltip is using a Time object
Somehow this test existed on EE but not in CE, so it started failing
after a bad CE-to-EE merge.
See merge request !2398
This is intended to prevent the user from creating new objects while the
transaction that removes them is being run, resulting in objects with
nil authors which can then not be edited.
See https://gitlab.com/gitlab-org/gitlab-ce/issues/7117
Improve admin area button style
A lot of the buttons in the top right in the admin area were too big. This makes those the new `btn-nr` size which seems to look nice.
## User buttons
### Current

### New

## Project edit button
### Current

### New 
## Label button
### Current

### New

cc/ @jschatz1 @creamzy @skyruler
See merge request !2351
Add user's last used IP addresses to admin page
This would help admins figure out from where spam is originating.
Screenshot:

See merge request !2381
Improve button styles
I noticed a couple of buttons don't match the newer styles.
## Issue edit note form
### Current (cancel button is big)

### Now

## Merge request code discussion
### Current

### Now (Also changed to `btn-save` class which changes to green. This matches everything else)

cc/ @jschatz1 @skyruler @creamzy
See merge request !2350
changes bolded on active for dropdowns, sitewide.
Fixes#6056 <br/>
**Note:** this change applies to all dropdowns. Currently all dropdowns using bootstrap's dropdown.js apply a bold and larger font for an active state.
See merge request !2377
Improve performance of getting issues on group level
For testing I used the URL http://localhost:3000/groups/gitlab-org/issues?milestone_title=8.1. Prior to these changes said URL would take about 10-12 seconds to load. By applying these changes the loading time has been reduced to roughly 2-3 seconds.
There's still some stuff going on in some views that I have to look at, resolving those changes might reduce the loading time a bit more. I also still have to check if I didn't break too many tests.
Fixes: gitlab-org/gitlab-ce#3707 gitlab-org/gitlab-ce#4071
See merge request !2318