New (and working) home background image settings

* Custom background support
New FAQ post type, and many Video-related improvs

* No price page anymore
* New Portuguese (Brazil) language strings
* New FAQ & Video post types
* New [sect /] shortcode and positions on header
* New featured image size for blog posts
* Video page: less code for video embedding;
* Featured video: now you can preview it on editing;
* Contact page semantic code adjusts;