Removed translate from .peg and made it a bit more visible

The `.peg` is a bit more visible by putting it a bit lower that where it was and without using the `translate`.

You can check the suggested demo here:
https://dl.dropboxusercontent.com/u/15234/nprogress/nprogress/index.html

In the screenshots below I have changed the shadow color to red to demonstrate better the change.

The original:
![original](https://f.cloud.github.com/assets/125676/1091938/54ec53e0-1671-11e3-8d84-b5f5280978c1.png)

The suggested:
![suggested](https://f.cloud.github.com/assets/125676/1091939/57e76f62-1671-11e3-9a84-2b6ae0f76351.png)