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
Added delete button to snippet view
Added tooltip to snippet public/private icons
Don't show 'Filter by labels' text if there are no labels
Don't show project search form if there are no projects
Merge remote-tracking branch 'upstream/master'
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
fixed nav bar for empty repos (fixes #4375)
Merge pull request #4323 from axilleas/update_docs

Create uploads dir otherwise backup fails. Fix #4304
Adding detailed documentation of the markdown syntax.

This includes standard markdown as well as GitLab extended markdown as well as references to documents used.
fixed typo in assgned
Merge branch 'muskox-master'

Closes #4424
Merge branch 'master' of git://github.com/bbodenmiller/gitlabhq into bbodenmiller-master
Tweak wording and phrasing
Merge branch 'bbodenmiller-master'

Closes #4331
Doc: set permission on config.database.yml
Fixed db/schema.rb
Merge pull request #4460 from tstone2077/feature_help_markdown

Adding detailed documentation of the markdown syntax.