History fixes

I fixed a few problems that @antograssiot pointed out:

* Current request button in history panel doesn't work.
* Active indicator was not persisted.
* Going into history doesn't update summary data.

I also added some visual indicators for the history/non-history mode. It looks like:

![screencap](https://cloud.githubusercontent.com/assets/24086/4248870/e86890d2-3a6c-11e4-80fc-c30bb3f6d659.gif)

@markstory From what I can remember, `urlBase` could be remove...
It's not used in other places, I think that the global var `baseUrl` is doing the job