Update Status page Rails app

This updates the Gemfile dependencies and reduces the file load by 400KB, from 1.2MB to just under 800KB.

Changes:

• Update to Rails 4.2.5.1
• Update gems, Unicorn is now using the same version as GitLab CE
• Remove jQuery since we aren’t using it anywhere
• Remove Bootstrap.js since we aren’t using it anywhere
• Made copyright year dynamic so it will auto-update

/cc @jnijhof

Status changed to merged

mentioned in commit 7c6b55d8

Thanks!