Global cache variables
add carouselInitialized method on 'initialized.owl.carousel' event
carouselInitialized method description
Add carouselRefreshed method on 'refreshed.owl.carousel' event
Add to onScreenItems[] items on screen
forgotten overlayClass variable
fix warnings
fix 'not function' error
fix width calculation and overlay opacity
update cached values on 'changed.owl.carousel' event
initialize indicator
fix jshint warnings
fix many errors