update email regex to meet RFC 5322 requirements
update email regex to meet RFC 5322 requirements

regex borrowed from http://www.regular-expressions.info/email.html, previous regex wouldn't allow valid (and somewhat common) emails like brian.o'connel@mail.com.

redoing changes from PR #478 into the correct file
fonji/backbone-forms,fonji/backbone-forms,powmedia/backbone-forms,powmedia/backbone-forms