delete user missing in admin view

[fodiator]

Issue details

Please provide issue details here.
Remember, this is not a place to ask questions. For that, go to http://gitter.im/wallabag/wallabag.

Environment

• wallabag version (or git revision) that exhibits the issue: 2.0.1
• How did you install wallabag? Via git clone or by downloading the package? package
• Last wallabag version that did not exhibit the issue (if applicable):
• php version:
• OS: ubuntu 14.10
• type of hosting (shared or dedicated):
• which storage system you choose at install (SQLite, MySQL/MariaDB or PostgreSQL): SQLITE

Steps to reproduce/test case

login as admin
create a user
try to delete this user (or to change mail-adress)

Regards

[j0k3r]

Will be implemented in #2116