Fix crash on some iPhone 5 models when swiping.
Fix vertical swiper slides height. NOTE: vertical slides has still other issues.
Native-style scrolling in iOS 8 WebKit browsers:
 * iOS 8 fixed bugs in -webkit-overflow-scrolling CSS property and it work out of the box now - removed own hacks
 * removed -webkit-overflow-scrolling CSS property from html and added it to .container-menu and .container-content which are only scrollable elements in app.