Remove log level name from the log list & some styling fixes

- Remove the message-level from the view
- small columns (pid, date) get less width
- padding around the view

Closes COUCHDB-2135

**Preview:**
![bildschirmfoto 2014-04-11 um 21 58 32](https://cloud.githubusercontent.com/assets/298166/2684146/e514a15a-c1b3-11e3-997c-a7d8d6b4005a.png)