add - sort threads in timeline tab by start time

Now it sorts threads as in picture: 
![2014-10-19 18-52-50 4b9d2144-5616-11e4-9adb-3f26bc60b3a1 png 845x641](https://cloud.githubusercontent.com/assets/1964214/4693519/b3f9a3e0-579f-11e4-9e48-8cb044fdba36.png)


It seems that we should go back to previous view of timeline (but with hostnames separating feature)

`timeline.json` can be found on Gist (ask me)