autocomplete issues and preload autocomplete data.

update jquery-atwho-rails to v0.3.0

add autocomplete_source action to project for gfm autocomplete

move init_autocomplete layout from head_panel to project_resource
Save backup time as is.  Fixes #3857.
Fixed a nginx configuration

For some reason, if the nginx configuration is bound to an IP, it breaks the install, causing all git clone/push/pull operations to die with a 'fatal: The remote end hung up unexpectedly' message. Changing this configuration seems to fix the problem. I reckon that this is just a temporary fix. I don't know the ins and outs of GitLab well enough to vouch for this change, but I do know that these instructions are broken, and that this update will fix them.
Fix not using git.bin_path in config.

Closing #3614" and "Closing #3574.
Setting the working directory before git operations
Merge pull request #3877 from mikehaertl/3793-puma-relative-url

Puma configuration for relative base URL
Merge pull request #3862 from crazyscience/patch-3

Setting the working directory before git operations
replace selectboxes with filters
init filter links
Add Gitlab::VersionInfo class to fix and simplify version check.

It returns "yes" if required version is "1.7.10" and current version is "1.6.10",
because the patch version of current version equals to that of required version.
bring more usability to issues filtering. Block issues area on loading filtered results
Merge pull request #3834 from ichord/gfm-autocomp

improve gfm autocomplete
Update CHANGELOG
Merge branch 'enhancement/issue_filter_dropdown' of /home/git/repositories/gitlab/gitlabhq
Dont show fork button in personal projects. Point to fork if already forked project
Fix project labels scope
Admin.user page: sort projects, add better confirm message for leaving team
Add extra config for some advanced customization
Add custom sing-in text & google analytics
Merge pull request #3880 from hiroponz/fix-check-git-version

Add Gitlab::VersionInfo class to fix and simplify version check.