Tweak OpenHandler layout

Some changes to make it handle longer url better, and make it (imho) more intuitive

Changes:
 - [x] Use fixed width for columns, except url
 - [x] Truncate url's when to long
 - [x] Click on URL to load data
 - [x] Remove filter on Method
 - [x] Seperate button to filter on urls
 - [x] Move date/time to first column
 - [x] Left-align, not center

Preview:
![image](https://cloud.githubusercontent.com/assets/973269/4057172/4dea9af4-2dc5-11e4-8735-8a0238afcbf9.png)

Old example for reference:
![image](https://cloud.githubusercontent.com/assets/973269/4057186/7a37c1f4-2dc5-11e4-870a-14c020b36135.png)