Update installation.md

Updated incorrect/outdated references to unicorn.rb; changed to puma.rb
Update installation.md

Additional unicorn -> puma reference update
Update README.md

Updated the relative links in ## Contents to point to the correct documents.
Fix new-tag-btn align
squash commit summary in one sentence
better ui for protected branches page
Add seeds and improve ui. Remove snippet expires_at
Improve UI for project snippets
Minor ui fix for snippet
Merge pull request #4583 from szicari-cars/master

Updated README.md
Merge pull request #4563 from mpwoodward/patch-1

Update installation.md
Merge pull request #4564 from mpwoodward/patch-2

Update installation.md
User links to user snippets
Use gitlab-shell authorized_keys truncation. Fix issue with authorized_keys stored in different location
Revert "Update installation.md"

This reverts commit b5cd66d41de98c63fdb048e3d0ce600c9353e230.
Revert "Update installation.md"

This reverts commit 670e1be7a402b1340393d298c7ebc05930ed7ac3.
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Fix tests
Merge branch 'improve/snippets' of /home/git/repositories/gitlab/gitlabhq
Allow the ldap logins with email or username

Change-Id: I73b4aa4c46afd56ae02fb24abcd673c0724547e4