Allow public repo searching

GITLAB-1386

Change-Id: I9a0bbe8db1a9bb00cef33b3e1854d78844b70a45
Updated convience method to private
Fix #5313 hipchat 0.14.0 to use http_proxy
Fix HTTP push to public repos

When doing an HTTP push, git (as of v1.7.9) first do an info/refs
request, and only if this request requires authentication it asks the
user for its password and authenticates further requests.

The initial request normally clears without auth on public repos as it
doesn't update any ref. This patch forces every git-receive-pack
requests to provide authentication.
Postgres Client Needed for Ubuntu 13.04

It looks like the postgresql-9.1 package didn't include the actual client. Needed to install it separately to get this to work.
 Added support for Go's repository retrieval.

 - Simply adds the releavant meta link in the project's show action.
 - Information about this meta tag can be found here:
   http://golang.org/cmd/go/#hdr-Remote_import_paths
Use project methods instead of attributes.

- This should work correctly in all cases now.
- Added a new project method that returns the web url for a project without
  the scheme prefix.
Use web_url for web_url_without_scheme.

- Previus version was still incorrect as it ignored cases where GitLab would
  be installed in a custom location.
- This assumes that if this method can be calle, web_url will return a valid
  URL.
Simplify upgrade guide based on 6-4 functionality mentioned by Jacob.
Add note for assignee changes

Change to username per @PixnBits suggestion
Fix links to GitLab cloud
Merge pull request #5937 from RandomInsano/patch-1

Postgres Client Needed for Ubuntu 13.04
Merge pull request #5760 from dermoth/master

Fix HTTP push to public repos
minor language fixes
Add UI for downloading various archive formats.

Change the “Download” button to a split button with options for zip and
tar.gz.
Added download option to tree view.
Merge pull request #5969 from jhollingsworth/feature/zip-archive-ui

Add UI for downloading various archive formats.
Use css truncation instead of rails

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'fix_links_to_gitlab_cloud' of /mnt/ebs/repositories/razer6/gitlab-ce
Merge branch 'hooks_spelling' of /mnt/ebs/repositories/mmoll/gitlab-ce
Dont render README with markup if format is not compatible

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>