Update docs to use 4-1-stable
Up to 4.1.0
Fix init script recipe url for 4.1 in check.rake
Add hotfix for smart http
 Fix for 404 at commits/tree
Update doc/install/installation.md

Line 295: sudo /etc/init.d/gitlab restart
Results in: "Error, unicorn not running!"
This is because unicorn is not yet running for first boot. I suggest changing this to 'start'.

Line 305: sudo apt-get install nginx
Change command to: sudo apt-get -y install nginx
Allowing automated install to simplify and follow pattern of earlier installs.
Update app/models/repository.rb

Issue #2699 - Download button not functioning. Replaces slashes with underscore in downloads filename
Merge pull request #2723 from ZKjellberg/patch-1

Update doc/install/installation.md
Merge pull request #2726 from McJoppy/download-archive-bug

Update app/models/repository.rb
fix deleting non-existing repo
Merge branch '4-1-stable' of https://github.com/gitlabhq/gitlabhq
Merge branch '4-1-stable' of git://github.com/gitlabhq/gitlabhq
Merge branch 'master' of git.former03.de:former03-sysadmin-infra/gitlab
Check if project.repository before check

Fix for #2776
Using empty_repo? instead

Display message if repository is empty
Add api for creating/listing/viewing groups
Add docs/tests for groups api
Fix groups api: differ between users and admin
Add api for creating/listing/viewing groups
Add docs/tests for groups api