title: UICollectionViewFlowLayout with different cell sizes unintentionally aligns cells from center
body: <p>I'm working on an IOS app which requires UICollectionView with different cells with different cell sizes.
  I sucsessfully implemented the UICollectionView based on those requirements, but for some reason, <strong>it made the smaller cells align from center</strong>:</p>
  
  <p><a href="https://i.stack.imgur.com/GWFW0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GWFW0.png" alt="enter image description here"></a></p>
  
  <p>All the code is implemented in a single viewController, <a href="http://pastebin.com/PyZ6wAVY" rel="nofollow noreferrer">pastebin link</a></p>
  
  <p>Can someone help me figure out <strong>how to align the cell from the left</strong>, like it does in the most basic implementation (unified size for all cells).</p>
  
  <p>It seems that the size differences messes with the collection layout..</p>
  
  <p>Any help will be much appreciated!</p>