Create uploads dir otherwise backup fails. Fix #4304
contributing guideline updates

* updated close policy
* added line on courtesy & respect to volunteers
* request that issue information be placed in first issue post
Fix missing assigned_to renaming in 2e839ce

fixes #4360.
Rename unspecified to make it clearer and in line with scrum terminology.
Add animated screenshots.
Notes about what PR's we would like to see.
Detail gem update policy.
fix bad constant reference in `project_routing_spec.rb`.
Merge branch 'animated-gif' of /home/git/repositories/gitlab/gitlabhq
Merge branch 'gem-update-policy' of /home/git/repositories/gitlab/gitlabhq
Merge branch 'contributing-pull-requests' of /home/git/repositories/gitlab/gitlabhq
whitespaces in gitlab.yml.example
Merge pull request #4361 from kenips/master

Add missing assigned_to renaming to merge_requests_load_context
Merge pull request #4419 from jlgeering/master

whitespaces in gitlab.yml.example
Merge pull request #4412 from senny/fix_bad_constant_reference

fix bad constant reference in `project_routing_spec.rb`.
Merge pull request #4393 from dosire/scrum-improvements

Rename unspecified to make it clearer and in line with scrum terminology
Gravatar image fixes when gravatar unavailable

-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
Rebasing on master

Change-Id: Iad49f225f23675b843457df5d6965c7cd50e99a3
Merge pull request #4239 from karlhungus/feature-alt-text-for-gravatars

Gravatar image fixes when gravatar unavailable
Merge pull request #4323 from axilleas/update_docs

Create uploads dir otherwise backup fails. Fix #4304