- Add pinning feature
- Modify layout for small screen size
- Update parent title when to click the link in iframe
- Update url path of browser when to click the link in iframe
- Bug fix when to access by direct url
- Bug fix of scroll postion of iframe

- extract to common/yona.Usermenu.js
- refactor some magic number

Yona support social login, Github and Gmail.
It doesn't need to sign up anymore.

This feature was easily developed thanks to "Play Athenticate"
See: https://github.com/joscha/play-authenticate

- Decrease input text font size
- Increase usermenu sidebar size 400px -> 420px
- Remove redundant codes

and so on..