Email address not recognized with leading or trailing spaces.

When the setting to allow users to login with email addresses or user names is selected, the incoming data is tested with leading and trailing spaces. This leads to confusion when attempting to login and can cause some issues when creating or testing new users because two users could end up with nearly identical username/emails because of the extra spaces. I can't really see a scenario in which the leading or trailing spaces could be useful so I think it is probably best to trim them off.