Make notification like view look consistent to comment view

Fixes #1913

I did update the view of like notification to make it looks more like comment counterpart. The results looks like this:

![ios simulator screen shot 20 jul 2014 21 07 47](https://cloud.githubusercontent.com/assets/151760/3638284/4814f2a6-1041-11e4-9d4c-3131afcf5b97.png)
![ios simulator screen shot 20 jul 2014 21 07 36](https://cloud.githubusercontent.com/assets/151760/3638283/48145e2c-1041-11e4-9eec-1acbe7f01220.png)


Just a nitpick - missing space between alloc] and initWithString :smile: