Small fixes

- Added a logfile to the examples so that they show the log instead of an error.
- Removed the redundant *Download config* button because the config is already saved in the `result.json`.
- Made the `result.json` downloadable from everywhere in the overview.
- Improved the proxyconfig `toString` method
- Hardened the `toBeanMap` method
- added a play/pauze button to the overview plugin so you can pause the graph rendering. 
![Screen Shot 2013-03-01 at 9 49 22 AM](https://f.cloud.github.com/assets/992615/210656/6a8e0832-8298-11e2-8a91-7ff256229973.png)
- Made the crawl overview stateful so that the Graph doesn't disappear when you go to another page. States now open in a new page.