amp 8.x-1.0-beta3

Changes since 8.x-1.0-beta2:

• #2689197 by mtift: Update README and documentation to reflect the change from /amp to ?amp
• #2685509 by sidharth_k: Add ability to see statistics on Full Page HTML conversion
• #2685509 by sidharth_k: Respond as late as possible for Full HTML page conversion so that we get the final html
• Change help text as amp pages are now controlled by query params
• Minor improvements to AMP Library test page - Show a sample conversion instead of a diff which is confusing
• #2676922 by mdrummond, mtift, Dave Reid: Remove need for aliases and switch to query string (i.e. "?amp")
• #2678990 by mtift: Look at hard-coded URLs to ensure they work when Drupal is not installed at the domain root
• #2685793 by mtift, mdrummond: Fix strict warning
• #2685791 by mtift: "Save and view AMP page" is not available on AMP-enabled node edit forms
• #2685793 by mtift: Convert amp_get_formatted_status_list() to a method on EntityTypeInfo
• #2685509 by sidharth_k: Drupal full page HTML amp library support related changes
• Add a heading in the drupal log notice
• Fix AMP status when module is first installed
• #2678992 by mtift: Add update hook to remove node_types from amp.settings
• #2685271 by mtift: Convert amp_get_enabled_types() to a service
• #2678992 by mtift: Add enable/disable and configure links to each content type
• Process Full HTML of page through AmpHtmlResponseMarkupProcessor again; this time controlled by AMP config options for opt in
• Add full html processing related options for AMP library on AMP config page; make AMP library related config its own fieldset