Mail bug fix

Changes: 

1. Updated rails to 4.1.7 and 10 failing tests. All because of change in the mail interface for parsing emails.

2.  In app/model/user.rb, 
to parse an email,  the interface is changed to:
Mail::Parsers::AddressListsParser.new.parse(email)
After doing above change, 2 failing tests. Both case of trying to parse invalid emails, 
ex:   Mail::Parsers::AddressListsParser.new.parse('my invalid email')
This raises exception. Follow up on mail issues page(https://github.com/mikel/mail/issues/827)

3. In app/model/user.rb, 
Rescued and returned false for valid email present whenever parsing exception from mail raised.