Extend default link_to helper to add noreferrer html_option.
Add nofollow to all internal links.
Add bash one liner in updater doc due to change of updater location.
Update the one-liner.
Merge branch 'updater_location' into 'master'

Updater one liner based on location

Fixes #1303
Merge branch 'add_noreferrer_to_all_links' into 'master'

Add nofollow to all external links

Fixes #1224
Merge branch 'master' of github.com:gitlabhq/gitlabhq