Filters: Add filter for bloginfo to remove http(s) from urls.

[ryanneufeld]

Make css/js urls protocol agnostic.

Fixes gh-312

[ryanneufeld]

this was an auto whitespace trim by my text editor, the blank line was there containing only a tab char.

[scottgonzalez]

This is a good start, but it's not enough to remove all the mixed protocol problems. There are other calls to get_*_directory_uri(), such as those in the footers and there are calls to enqueue_script() which have scripts registered with protocols defined.

[scottgonzalez]

There are lots of style guide violations in this code.

[scottgonzalez]

Use ===

[scottgonzalez]

It looks like this covers everything for the CDN to work properly on HTTPS.

[scottgonzalez]

It looks like we can replace this with:

add_filter( 'theme_root_uri', function( $url ) {
    return preg_replace( '/^https?:/', '', $url );
}, 10, 1 );

Which would make the existing calls to get_*_directory_uri() use protocol-relative URLs. This would prevent us from regressing with new code.

[ryanneufeld]

So can this be merged?

[scottgonzalez]

Shorten this to match the theme_root_uri implementation.

[ryanneufeld]

This should be the simplest form of this fix now.