Cannot create user with apostrophe in email address

[anonymous-matomo-user]

When attempting to create a new user in piwik, if the user's email address contains an apostrophe (eg o'[email protected]) Piwik returns "The email doesn't have a valid format."
However apostrophes are valid in the local part of email accounts.

[robocoder]

Pull request #51 35bcaca was merged.

Before closing this ticket, uses of email address should be reviewed. For example, in core/Controller.php, an apostrophe appears to break the mailto.

https://github.com/piwik/piwik/blob/master/core/Controller.php#L676

[mattab]

This was fixed almost a year ago. I reviewed uses of email and they are all using double quotes.