Add link search feature

With this feature, users can specify search pattern in URL like this http://kibana.com/logstash.json?query="defg". And Kibana will automatically search this pattern. 
![screenshot from 2013-08-14 12 21 07](https://f.cloud.github.com/assets/1437241/959766/fc01f882-0498-11e3-88f7-81fae0cd0069.png)