Fixed a bug when start swiping a cell.

Now when starting to swipe the cell, the swipping view appears immediately (before the first & second triggers positions)

Before the swipping hit the first trigger position this was happening:
![screen shot 2014-12-11 at 11 20 36 2](https://cloud.githubusercontent.com/assets/5262312/5393340/cff63704-8128-11e4-88d1-d01cecc2cc9f.png)

I'm using autolayout (yes, I know that this is not supported, but had no other problems, it's working really well) and did not check this issue without autolayout.