v5.1.0

• Update Normalize.css to v3.0.3.
• Use https:// in the Google Universal Analytics snippet
  (eee759b).
• Remove the visibility: hidden declaration from .hidden
  (#1663).
• Use <meta http-equiv="x-ua-compatible" content="ie=edge">
  
  instead of <meta http-equiv="X-UA-Compatible" content="IE=edge">
  (#1656).
• Update Apache Server Configs to v2.13.0.