when user changes displayName, also update it on expand button
update oldDisplayName value on displayName change

This patch fixes a bug that can be reproduced in following way:

1. change displayName
2. clear text in displayName input click change again

Then you will get an error and previous displayName will be restored.

Expected behavior should restore the new updated displayName.
add span tag to displayname on expand button
Merge branch 'master' of github.com:owncloud/core into issue_1776

Conflicts:
	core/templates/layout.user.php
use text method instead of html method
remove Gwr
Merge pull request #1885 from houqp/issue_1776

when user changes displayName, also update it on expand button