Change email modal

Fixes #1105
Also fixes #1106
![screenshot 2014-04-08 14 08 43](https://cloud.githubusercontent.com/assets/602762/2649472/c3fb1f82-bf63-11e3-9bf1-d972e3b18e66.png)
![screenshot 2014-04-08 14 08 54](https://cloud.githubusercontent.com/assets/602762/2649473/c3fd1e7c-bf63-11e3-9f26-5eb31d240516.png)
![screenshot 2014-04-08 14 09 01](https://cloud.githubusercontent.com/assets/602762/2649474/c3feb728-bf63-11e3-8fcb-3dc24f620553.png)

Depends on #1102 since I changed the way the change email/password modal is implemented in that pr.