Display URL downloading from

instead of just filename.

I want to know whether I'm getting it from PyPI or from my internal devpi server, for example.

Before:

It showed just the filename:
![screen shot 2014-12-13 at 4 25 17 pm](https://cloud.githubusercontent.com/assets/305268/5425954/05610fd6-82e6-11e4-8e5f-355e94c39f78.png)

After:

It shows the full URL (but without the fragment part with the checksum):
![screen shot 2014-12-13 at 4 25 42 pm](https://cloud.githubusercontent.com/assets/305268/5425955/0df7d940-82e6-11e4-8c78-45425c98067e.png)