game of life algo added

@sagivo refactored the algo. Please take a look.
Did a little benchmark on it for 100x100 matrix.

Previous code:
![screen shot 2014-12-23 at 1 26 37 am](https://cloud.githubusercontent.com/assets/2367863/5530180/1c72c156-8a43-11e4-8b6b-b842c2d4da16.png)

Current code:
![screen shot 2014-12-23 at 1 15 25 am](https://cloud.githubusercontent.com/assets/2367863/5530184/25566dfe-8a43-11e4-8648-cecbb0e01e08.png)