v1.4 Enhancements

* Added new $xsbf_theme_options variable to specify whether to add
theme support for Jetpack Testimonials. Turned off here by default.
* Turned off touch support by default
* Turned off Font Awesome by default.
* Turned off sample widgets and sample footer menu.
* Updated readme.txt to focus just on this child theme, not duplicate
information already in the parent theme.
* Update screenshot to reflect home page being the blog.
* Bumped version to match parent theme.