Corrected new directives in CSP and allow openfontlibrary from http://
Depreciated http_status(). Update to http_status_code().

http_status_code() is a default PHP function which does the same thing.
For now, make http_status() an alias of http_status_code()
Updated Node transversal and adding nodes.

Updated append(), prepend(), after(), and before() to accept HTML or
Elements. Added Element.next() method.

Rearranged similar methods to be near each other.

Removed most properties from <progress> on ajax requests. Do not set
value, leaving it as indeterminate until progress is made.
Removed notifyLocation() in window.load

Was only there to test getLocation() promise/function
Use flex: 0 1 auto instead of 0 1 100%. THANKS SCOTT!

Fixes problem where Chrome would collapse <main> because it's content
was computed to be zero-height. Sidebar and footer were being stacked on
top of the article.