Fix XSS vulnerability on user's name

Names parsed from incoming emails are stored in the database as is. This
pull request addresses potential XSS vulnerability due to improper display
of unsanitized names. Going forward names will be scrubbed on create.
Merge pull request #1108 from protich/issue/xss-user

Fix potential XSS vulnerability on user's name

Reviewed-By: Jared Hancock <jared@osticket.com>