Update wp title customization for 4.1

[joseluis]

• https://make.wordpress.org/core/2014/10/29/title-tags-in-4-1/
• https://core.trac.wordpress.org/changeset/30074
• https://core.trac.wordpress.org/ticket/18548#comment:96

Functions and hooks

• http://wpseek.com/function/_wp_render_title_tag/
• http://wpseek.com/hook/wp_title_parts/

[joseluis]

For now it's ok as it is. Closing