Fixing crash and Issue 9

[graetzer]

• Fixes the Issue of upscaled images wich occurs if the partition algorithm assigns a single item to one row.
• Incorporates a fix for a crash on [UICollectionView insertSections:] from Pull Request #24
• It implements swipe in and out animations, when inserting or removing cells.

(Last one should be optional, but I didn't have time to implement that yet)

[njdehoog]

@graetzer Thanks for your PR. I am no longer maintaining this project. Would you mind if I just point people to your fork in the README?

[graetzer]

Sure I think that's the best idea, if you don't want to test and merge the code.

[njdehoog]

Honestly it's been too long since I looked at this code, and I don't have the time to maintain it at the moment. I updated the REAME. Thanks again.