Don't display edits during user's name update

![image](https://f.cloud.github.com/assets/3401659/2178173/0c437ef0-965c-11e3-9822-8c95943a0b63.png)
Per [discussion on meta](https://meta.discourse.org/t/changes-in-profile-preferences-dont-get-saved-automatically/12198/2) this unbinds the name field on the user preferences page so that the display of the user's name does not update until the form is saved. 

I verified that input validation still works.