Disallow having duplicate emails, allow logging in with email instead of username

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More than one account can't have the same email.

When emails are unique those can be used for login as well.

Original issue reported on code.google.com by rii...@gmail.com on 19 Apr 2013 at 8:45

[GoogleCodeExporter]

Original comment by rii...@gmail.com on 9 Aug 2013 at 2:47

• Changed title: Disallow having duplicate emails, allow logging in with email instead of username
• Added labels: Priority-High
• Removed labels: Priority-Medium

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Original comment by rii...@gmail.com on 9 Aug 2013 at 5:38

• Changed state: Started

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Original comment by rii...@gmail.com on 16 Aug 2013 at 7:20

• Changed state: Done