A weird commit from 1970

GitHub detects one Git commit by @skomski from... 1970. This is breaking the [contributors page](https://github.com/nodejs/node/graphs/contributors). It was OK few months ago. Screenshot:
![screen shot 2015-09-05 at 19 15 08](https://cloud.githubusercontent.com/assets/1758366/9701618/e48e89a0-5431-11e5-9736-15c76d0fb947.png)
