Fix popover position when using foreach binding

[netarrow]

When using a foreach binding, the position of the popover is calculated before binding is applied, so a smaller height is used and the popover appears moved down relative to the trigger element. This fix recalculates the position after the bind.

[kirtapatrik]

For left, top and bottom position, we have to correct the left position. https://github.com/billpull/knockout-bootstrap/pull/14

                var triggerElementOffset = $(element).offset();
                var triggerElementHeight = $(element).outerHeight();
                var triggerElementWidth = $(element).outerWidth();

                var popover = $(popoverInnerEl).parents('.popover');
                var popoverHeight = popover.outerHeight();
                var popoverWidth = popover.outerWidth();

                var arrowSize = 10;

                switch (popoverOptions.placement) {
                    case 'left':
                        popover.offset({ top: triggerElementOffset.top - popoverHeight / 2 + triggerElementHeight / 2,
                                         left: triggerElementOffset.left - popoverWidth - arrowSize
                        });
                        break;
                    case 'right':
                        popover.offset({ top: triggerElementOffset.top - popoverHeight / 2 + triggerElementHeight / 2 });
                        break;
                    case 'top':
                        popover.offset({ top: triggerElementOffset.top - popoverHeight - arrowSize,
                                         left: triggerElementOffset.left - popoverWidth / 2 + triggerElementWidth / 2
                        });
                        break;
                    case 'bottom':
                        popover.offset({ top: triggerElementOffset.top + triggerElementHeight + arrowSize,
                                         left: triggerElementOffset.left - popoverWidth / 2 + triggerElementWidth / 2
                        });
                }
            }