title: Allow last UITableViewCell to scroll till first row
body: <p>Generally in UITableView last UITableViewCell is not allowed to scroll up, I want to allow last UITableViewCell till it reaches first row.</p>
  
  <p>One way I know is to adding empty footer to UITableView, but I can not figure out how much space I need to give footer to allowing last row to scroll.</p>
  
  <p>Edit : Adding empty footerview to UITableView did trick for me</p>