Core Plus 2.5.7 work.

	* [Bug] Prevented the admin_group page attribute from displaying on forms.
	* [Bug] Added additional logic in the admin menu to be able to render on legacy codebases without the
	  proper jquery version.
	* [Feature] Created a \Core\parse_html function.  This scans for <img/> tags and replaces them with
	  server-resized versions if necessary.
	* [Feature] Added in Directory_local_backend, File_local_backend, and Template classes to support
	  legacy versions of the code.
	* [Feature] Added the ability to specify the <h /> level for the starting element of the Changelog
	  system.  Useful for creating custom changelog reports.
	* [Feature] Added a "/core/security/x-frame-options" config option for defining the X-Fame-Options
	  header.  Defaults to "SAMEORIGIN".
	* [Feature] The admin menu now responds to touch events as well as hover.
	* Moved Core::Redirect to \Core\redirect
	* Moved Core::Reload to \Core\reload
	* Moved Core::GoBack to \Core\go_back
	* Minor fixes in the Changelog system for parsing files.