Display Customer Company-Name next to CustomerID-Dropdowns.

I found it to be quite a hassle to select the appropriate Customer-ID, because our CustomerIDs are somewhat cryptic (like "00120000005K2uhAAC").

So this pull request adds the Companyname of a Customer next to its ID in Dropdown-fields in the statistics-module (see screenshot).

![capture](https://f.cloud.github.com/assets/654548/2246826/8398c63c-9d68-11e3-8cbd-34b6b098b4e8.PNG)