Conflicts:
	app/controllers/admin/teams/projects_controller.rb
	app/views/team_members/_team_member.html.haml
	app/views/teams/members/_member.html.haml

Adding detailed documentation of the markdown syntax.

Closes #4331

Closes #4424

This includes standard markdown as well as GitLab extended markdown as well as references to documents used.

Create uploads dir otherwise backup fails. Fix #4304

Gravatar image fixes when gravatar unavailable

Change-Id: Iad49f225f23675b843457df5d6965c7cd50e99a3

-Alt text to image was set to hash, which would make the page display hashes if the image/gravatar  wasn't available, set the alt text to '', and made the main tool bar image follow the same or similar constraints as the other images (.avatar, .s26)

Conflicts:
	app/assets/stylesheets/themes/ui_bb.scss
	app/views/snippets/_snippet.html.haml

Change-Id: I42e1e86f535486fd2556d4b3e4591f3676eea033

Apply user project limit only for personal projects. We should not include group projects for user limit

Rename unspecified to make it clearer and in line with scrum terminology

fix bad constant reference in `project_routing_spec.rb`.

whitespaces in gitlab.yml.example