Upgrade BxSlider v4.0.0 to BxSlider v4.1.2

Changelog

Version 4.1.2
-Added bower.json configuration file. Manage bxSlider as a dependency using bower.

Version 4.1.1
-Removed imagesLoaded library and added iframe preloading support
-Added responsive option - setting to false will prevent $(window).resize binding

Version 4.1
-Carousel mode (minSlides / maxSlides) was re-written to be more intuitive.
-SlideWidth now acts as it should (slides respect the width value).
-SlideWidth now properly parsed: accepts string ("600px") or integer (600).
-Slider now only needs to load visible slides (by default) in order to initialize which results in much faster loading. A "preloadImages" setting allows for configuration.