add myschedule filter + add favorite management in speaker talks page + login

- [x] As a devoxian, I want to see my favorites talks in schedule page to know which talk I (have|will) attend. (in: http://www.devoxx.be/dv13-schedule.html)
- [x] As a devoxian, I want to had talks of my favorite speaker in my schedule on speaker page in order to be a good fan! (in: http://www.devoxx.be/dv13-filip-maelbrancke.html?presId=3667)
- [x] As a devoxian, I want to login/logout in schedule pages in order to see my schedule easily

NB: Added a MySchedule button filter in schedule page. Button is hidden if user is not logged and is unselected by default.

@jayv @stephanj