Reduce image size.

Checking the site with the PageSpeed extension, one of the reports was
in reducing image size.  This reduced the number of bytes by 67%.

It was done with optipng -o7 -fix *.png in the app/assets/images dir.

References:
  optipng: http://optipng.sourceforge.net/
  PageSpeed extension: https://developers.google.com/speed/docs/insights/using_chrome
Fix #5313 hipchat 0.14.0 to use http_proxy
Add comment about tls for ldap method

`omniauth-ldap` also supports tls for ldap method
Update installation.md

Updated the version of Git used in the section for compiling Git from source.

Also, changed the verbiage used in the section "Initialize Database and Activate Advanced Features". It previously said to type 'yes' to install the database.
refactor omniauth configuration method

This refactoring allows a user to use omniauth providers which do not
use ```app_id``` and ```app_secret``` without needing to change the
devise configuration.
 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.
Merge branch 'master' into logo-white-compress

Conflicts:
	app/assets/images/logo-black.png
	app/assets/images/logo-white.png
Another optipng run over png's.

Ran optipng -o7 -fix over all png files. This should make pages load a
tiny bit faster (you can test this with the pagespeed tool on firefox or
chrome).

It might be an idea to add *lossless* image compression optimization
runs to the release process.
Also optimise gifs with gifsicle.

These are the same gif files just after running
gifsicle -b --optimize **/*.gif
Simplify upgrade guide based on 6-4 functionality mentioned by Jacob.
Add note for assignee changes

Change to username per @PixnBits suggestion
Instructions should create a merge commit and give people a chance to test the branch we are going to merge.
Update clone panel to use input group.

Use clone panel in `Git Access` section of wiki.
Update the init.d file to the correct locationof the example defaults file
Update the example defaults, include the rest of he variables
Ask people to link bakc and be prepared for feedback.
Instead of working with remotes Dmitriy suggested to use urls.
Since the 22th is fixed we can use absolute dates.
Ordinal numbers do not have the same ordinal.