Add milestone expire date to the right sidebar
## What does this MR do?
Shows milestone expire date tooltip in the sidebar. It also shows the tooltip when sidebar is collapsed.
## Are there points in the code the reviewer needs to double check?
`common_utils.js.coffee` and `milestones_helper.rb` should be reviewed deeply.
## What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/issues/17355
## Screencast

See merge request !4448
Only load Chart.js when necessary.
Only load Chart.js where it's used, namely the Graphs section. Follow up on !4394.
cc: @jschatz1
See merge request !4516
Fix local timeago on user dashboard
## What does this MR do?
Fixes incorrect date times on tooltips on the dashboard page
## Are there points in the code the reviewer needs to double check?
Yes, The tooltip has to be recreated again because we needed a custom CSS classname in order to fix the date being splitted into two lines.
## Why was this MR needed?
Because the datetimes were incorrect we have to have the same format for .timeago() instances.
## What are the relevant issue numbers?
#17607
## Screenshots (if relevant)
**Before**
<img src="/uploads/f40cd58e8086d9675262e98a1fe57885/Screen_Shot_2016-05-24_at_7.23.25_PM.png" width="705">
**After**
<img src="/uploads/bd48046ef11659cc742f827b3404fbcd/Screen_Shot_2016-05-24_at_7.22.29_PM.png" width="704">
See merge request !4285
Blur button tags when pressed to remove the focus state.
## Before

## After

See merge request !4418
Show loading indicator for autocomplete

Closes#15435
See merge request !4182
#17284 Edit form does not cancel correctly
## What does this MR do?
Replaces the markdown textarea with the currently saved note text when the note edit is cancelled.
## Are there points in the code the reviewer needs to double check?
No
## Why was this MR needed?
Allows the user to revert back to the original note text, as expected, using cancel.
## What are the relevant issue numbers?
Fixes#17284.
## Screenshots

See merge request !4175
Updated CHANGELOG
Corrected the changes to store the markdown in a hidden input when edit starts and retrieve the original from that input when edit is cancelled
Replaced hidden input with form attribute
Remove prev/next buttons on issues and merge requests
## What does this MR do?
Remove prev/next buttons on issues and merge requests sidebar
## Are there points in the code the reviewer needs to double check?
No
## Why was this MR needed?
The buttons were rarely used and added at least 1 query each on every page load which we could live without.
## What are the relevant issue numbers?
#18026
## Screenshots (if relevant)
Below is how it looks. Not sure if it's too much empty space. #17697 discusses a possible substitute for what to put there.


See merge request !4442
Notes are awardables
## What does this MR do?
Makes sure we can :thunder_cloud_rain: comments/notes.
## What are the relevant issue numbers?
Follows up upon !2901, depends on !3785Closes#3655
## Screenshots (if relevant)
TODO
See merge request !4291
Upgraded jQuery to version 2
## What does this MR do?
Upgrades jQuery to 2.2.1.
Had to include the task_list JS file directly as it includes jQuery 1 directly https://github.com/github-archive/task_list/blob/master/app/assets/javascripts/task_list.coffee#L8 so when we change jQuery to `jquery2` it was including both jQuery 1 & 2.
## Are there points in the code the reviewer needs to double check?
For any JS errors
## What are the relevant issue numbers?
Closes#12440
See merge request !4384