Searching by email instead of uniqname for queue not allowed

[OscarSong2003]

Currently, the user does not allow emails to be searched in the search for queue box in the home page. Thus, if there's a queue created by uniqname "osong" for example, searching osong@umich.edu would not yield results and give the warning message. Not sure if the team wants to potentially support searching by email as well.

I made a potential fix that will just strip the @umich.edu portion from the search text as a potential solution, but also think current implementation is still acceptable to user (given that a warning is incorporated).