systrace parsing new edition

Created by: joelagnel

Hi @derkling , I went ahead and re-wrote #243. This is very fresh so I am just posting it early for any comments. This approach is more cleaner and also doesn't have issues with #243. It also doesn't require dropping custom strings written by tracing_mark_write that systrace doesn't recognize . I didn't add your test case but I ran some scripts to see it working and existing nosetests are passing. I would appreciate if you can integrate your test case from #243 to work with this PR and feel free to repost this PR with that. We can also close that old PR and work with this one. I borrowed your regex from the systrace format patch and given you credit in the relevant patch, thanks. CC @bjackman