Notify participants on close or reopen of issue/mr

Fixes #1891

cc @sytse

See merge request !1436

Also refactor NotificationService a bit

Improve project icon UI

See merge request !1435

Remove default project icon

See merge request !1434

Project avatar

See merge request !1433

Add return value example to ssh key creation

See merge request !307

Fixes typo in config.rb

adding avatar to project settings page added avatar removal show project avatar on dashboard, projects page, project page added rspec and feature tests added project avatar from repository new default project icon added added copying af avatar to forking of project added generated icon fixed avatar fork hound fix style fix test fix

Redesign services page

Make services page more user-friendly

See merge request !1432

Ruby 1.9 hash

See merge request !1430

UX improvements

* new project button is green
* show no-ssh error message
* fix avatar align

See merge request !1431

Documentation on how to copy your ssh key to clipboard with the console

This MR just adds some documentation in case people want to use the bash to copy their public ssh key to the clipboard.

See merge request !311

Password reset timeout

/cc @jacobvosmaer

See merge request !1428

Workflow description

See merge request !1429

Round avatars

* Make all avatars rounded for consistency
* Introduce variable for border-radius for avatars

See merge request !1427