This method block size request for cells for ios8 and pass for less or eqal ios7.1 Needs for autolayouts cells for iOS8

UITableViewBlockCellSizeCall.m

- (BOOL)respondsToSelector:(SEL)aSelector
{
    static BOOL            useSelector;
    static dispatch_once_t predicate = 0;
    dispatch_once(&predicate, ^{
        useSelector = SYSTEM_VERSION_LESS_THAN(@"8.0");
    });

    if (aSelector == @selector(tableView:heightForRowAtIndexPath:))
    {
        return useSelector;
    }

    return [super respondsToSelector:aSelector];
}