[Flicking] Makes panels can have paddings.

[jongmoon]

Description

If panels have paddings, panels overrides flicking area.

Steps to check or reproduce

http://codepen.io/jongmoon/pen/ZWdGgQ

#wrapper {
  width:100%;
  height:300px;
}

div.content {
  padding:0 100px;
}

$("#wrapper").flicking();

Result

The red panel overrides flicking area.

[jongmoon]

Should account panel's padding size when initializing panel width.